I don't wanna sound like a nagging Mum here, but I too have been into Benzo's in the past, in copious amounts, and my biggest concern for you would have to be to exercise restraint to some degree in your self dosing, simply due to the ludicrously addictive nature of Xanax.
Back when I was younger, I spend a fair bit of time in Cabramatta (Sydney's Heroin City) - everyone knows the basics of that kinda thing, so I'll fast forward 10 or so years. Having read that Xanax was 10-15 times stronger than Valium, I walked into my local doctors office and told him I would like to try some for the stress and blabla. To my surprise, he wrote me a script.
He kept writing me scripts for about a year or so, until one day, when he went to print-up a script, the computer made a BU BUH!, and would not allow him to give me ANY benzos. Here in Australia, the Federal Government has setup some kind of 'live database' for scripts like benzos and opiates, and doctors (legitimate ones anyhow) CANNOT go around it. Turns out, I'd been enjoying my Xanax so much, that the scripting database automatically red-flagged me, and basically, that was it: No more benzos of any kind for me.
That's the background, now for the summary.
Xanax withdrawl is absolutely *excruciating*. I spend 2 solid weeks lying in bed sweating (in mid winter), things felt like they were GNEWING at my joints from the inside, and the nightmwares. I could only sleep for an hour or two here or there anyway (simply cos of the restlessness), and when I did, it was for no more than an hour or so at a time, and only when I was completely exhausted from tossing and sweating, and stressing and having anxiety attacks.
You see where I'm going with this, right?
Make sure, you get yourself 2 packets and give them to a trusted family member, now. Cos if that supply ever runs dry, the withdrawls will swear you off benzos for live. I have only asked for Valium from a doctor once since those two weeks of agony, and the reason I asked for Valium on that occasion was (in a 2 month period), my dog had died, my exs mother had died of Cancer, which send her into nutcase-land which caused us to seperate, which meant losing the family I'd been with for almost a decade, and I was living in a shed sleeping on the floor. I just didn't give a fuck, .. so eventually, passing a doctors surgery I stopped-by and waited to see him about a script.
He said (Asian Doctor): "No, whyyy joo come bak afta dis time den jus for duh-rugs? Joooo a dlug addict!" .. So I storm-out, don't pay, and that was the end of any relationship with benzos for me.
Now, onto the REASON Benzos (Valium OR Xanax), work so well with weed It's because of the potentiating effect benzos have on a wide variety of drugs: Just like tobacco and piss, they open or 'prime' your receptors to absorb more of other substances: Be it pot, piss, opiates, whatever. Benzo's (much like alcohol) MAKE other drugs stronger. Same amount of THC going in - more being absorbed. It's much the same action as gulping Peganum Harmala (Syrian Rue, Wikipedia it) before taking LSA-based drugs (Morning Glory seeds, Hawaiian Baby Woodrose seeds, etc).
God this spell-check gives me the shits.
Pot and Xanax/Valium also (like many combinations of drugs) have a synergistic effect on one another. Same reason alcohol and cones work so well together, applies to benzos.
So, whilst I'm not saying "STOP! DON'T TAKE XANAX!", I AM saying, that if that supply ever dries up, you'll wish you were dead by the end of day 3-4 of withdrawls, and it'll just get worse and worse till about the second week mark. Forget this fuckn bullshit '3 day hump' shit, it takes 3 days with benzos to even START really feeling the withdrawls.
Anyway, be careful of that, and cover yourself by giving a close family member or friend (who doesn't take em) to hold them for you. That way, you have a way to taper-off them if you need to, cos stopping cold-turkey will make you feel like some kind of cave-dwelling sub-human. "My-y-y-y pre-e-e-ciou-s-s-s-sss".
And I have to oppose that 'takes 250mg to kill you' (can't remember who posted that one), but I was having 16 4mg Xanax some days, for months, and even with the tolerance I'd built-up to it, I'd have to run outside and hurl my fucking guts up sometimes, which could only be owing to mild overdose. That was on roughly 60mgs. I reakon you could easily die @ well under 250mg, I'm talking from experience though, not some google search result or Wikipedia article I read about it. Maybe some people CAN eat 250mg or MORE and be fine, but the addiction is so sneaky and slippery, you don't even realize how it's over-run you till it's too late.
Even Heroin withdrawls - I found - were a walk in the park, compared with Xanax.
EDIT: Sorry bout all the typos, but once any of my posts start getting 'brochure length', I tend to just shove grammar and literacy to the side, and just blurt it out to get it over with