Is it normal for it to feel hot and clammy one day after treatment?

It is normal to feel a little wet after the miraDry treatment.  Be patient and follow up with your treating physician.  If you need a second treatment, you can treat 3 months after your first treatment.

Our office specializes in advanced Miradry treatments and we would expect some rapid and slow changes in sweating of your armpits. Be patient and follow up with your surgeon if there are any unusual changes. Best, Dr. Karamanoukian Los Angeles

A day or two later you can still expect some hyperhidrosis from the treated area. Expect the underarms to be dry at 1 week and for some residual dampness at 3 month follow up. It should not be as severe as it was pre treatment # 1. If there is residual hyperhidrosis at 3 months, you may elect to have a second treatment. Read the miraDry book provided on the link below. 

Swelling and tenderness is normal and expected.  Some warmth might be expected too due to inflammation from the treatment.  It is probably normal what you are experiencing but if there is any redness spreading out from the axilla (armpit), you should call the doctor's office to make sure that there is no infection.  With regard to sweating, most people do experience some immediate reduction in sweat, but if you do not, you should just wait and see how you do once the inflammation subsides.  There is a second treatment recommended because not everyone is satisfied after just one treatment.  There is a 90% satisfaction rate after two treatments though.  If you do still have sweating after two treatments, do ask for a starch-iodine test to see if your residual sweat is outside of the treatment area, in which case it may not be something that can be treated with MiraDry.