Im suffering with hyperhidrosis and need your help..............?

I've picked the ICT diploma for my option in year 10 and my life was fine when the first 2 units where computer work, but now we are doing business skills with groups and a lot of hand work is involved. today was the first business day and i refused to take part. When the teacher asked why i said it's because I'm sick. I've been to a doctor and ive also been to hospital to see what the cause is in my blood but when my doctor recieved my bloods he said they were fine. Also my hands only sweat when im indoors but when im outdoors im fine. my autie kerry who is a mental health nurse tells me its because of the amount of tea i drink and that the caffiene could be the cause. All of last week i cut down on tea and i seen an improvement, but after that nightmare today i dont no what else i can do. Looks like when im older ill have a shitty job because most good jobs require good hand to hand work. HELL i cant even shake my mates hands!