Wholebody weakness + pain. This problem?

Dear Doctors, i stand at 98kg and 5.5ft. I was very well fine and active since June 2016. Post then had got involved on a diet advised by my physician and that was purely based on liquid, fruits and veggies. Well to appreciate i lost over 10 pounds in the very first month, and the result was a great evidence when seen physically. As i couldn't continue the diet regime after one month, i started migrating to my normal Indian Diet. After 2 months i've started noticing a serious change in me. My hands started to shiver when i hold a coffee cup, unable to active, i feel very lazy, intention to sleep more, over dullness, chronic body pain, chronic knee and leg pain (in-specific), tend to forget things immediately, muscles seem to be very loose both in arms and leg. I've been taking some multi-vitamin tab and calcium tab as recommended by GP, but still i'm unable to recover out of it. I have this habit of masturbating sometimes 4 times or twice a week. Can you help me out of this problem?