Community medical question

I want to gain my weight.....and other then this I feel pain in my sides lower then the ribs I have dark brown urination...other then this problem I am facing needle like pain which sometimes occur in my body for few seconds from a longer time may be a year...is it harmfull ?and other then this sometime I face shortness of breath for some few seconds and along with I face my heartbeat gets so down and get tears in my eyes...I faced this last year for the first time and after 5–6 months I gain face this sometime my heartbeat get so down or somtime shortness of breath or sometime both at a time...is this any clue of something behind my weight loss...If nothing then I want to gain my weight..can you suggest me some deit paln or something other for it ?