why do i sweat so much whenever i do even a simple exercise? Is it in any associated to over sleeping or the mid-thoracic pains

I used to play rugby but stopped 5 years ago.

for the last 4 years back pain has progressively increased.

i have had several pain killers including a local analgesic and cortical steriod injections.

there was improvement but later pain recurred and i was advised to see a physiotherapist who gave muscle relaxants, exercises and short wave diothermy, i improved alittle but pain persits, i gained wait since the injections, i sleep,  eat and sweat alot.

i am worried, please help.