I feel your pain. Please, sit down and smoke a really big fattie, maybe two or three.
Then put on some of those gloves your grandma used to wear to do the dishes and manually crush every aphid you can see on the stalk and stems, maybe wipe the underside of fan leaves too. If you're really serious you could also put on one of grannies old aprons, and clean your grow area and equipment like your aging rich mother in law was coming to visit. That let's the ones you're gonna kill by spraying know you're not fucking around.
Then turn off all your fans and remove your plants from under the flowering light(s) leaving enough light to work in. Spray the shit out of your plants with an organic dissipating spray, recognizing it won't totally dissipate and that some people can and will detect some of whatever you sprayed on it. Citric acid has already been mentioned or break out your wallet and use trifecta. Don't forget to spray under the leaves etc. Don't put your plants back under the lights for several hours. The more severe the spray, the longer the wait. Some people like to spray shortly before lights out so plants don't burn, etc. Repeat this procedure every few days, until the finish or until the aphids win. Possibly cut early or trash if it's beyond recovery.
After you harvest and dry, tap a branch holding the flowered buds and watch the dried carcasses of some dead aphids fall out, knowing that in your buds, some aphid cadavers might still lurk. Yum. Crackle. Pop. Only you can decide how much is too much.
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