First of all, what you are speaking of with your excess sweating is hyperhidrosis, not hypohidrosis.
Go to your local pharmacy and get a bottle of Certain Dri. It's a highly concentrated aluminum solution that you use only once every three days. Lots of people get relief from it, and I know quite a few people who use it. It stings, so don't use it immediately after shaving your underarms (if you shave).
If that doesn't work, and if the sweating bothers you, you can try botox injections or you can have a cardiothoracic surgeon perform endoscopic surgery to cut the Kuntz nerves that are branches of the sympathetic chain. There is controversy whether these nerves actually exist in humans. Surgeons claim they cut it, and the people who have had this surgery for facial blushing also report no sweating (at all) after the surgery. However, you usually compensate by increased sweating elsewhere (like your lower back).
You should have your thyroid levels checked to make sure you aren't hyperthyroid, particularly if you have used AAS in the past.