Hi, Let us understand your problems. You feel weakness and pain in your left hand and leg. So there are 2 possibilities. 1) That there is problem in your body, I mean leg and hand. 2) Problem is in your brain. And this problem occurs only in summer. Now coming to option 1. 1) Leg and hand weakness only in summer. This can occur if there is reduced blood supply, or nerve compression. It is not due to muscle weakness as it occurs only in summers and not related to work. This seems unlikely because hand and leg are supplied by different blood vessels. And blood supply is affected in periphery limbs in cold and not in summer. Also nerve compression will cause problems in all seasons. Coming to option 2 Your right brain may receive less blood supply during summer. This may cause sensation of weakness and pain in your left half of body. This is more likely. If you are also suffering from hemicranial headache then you should consult neurologist immediately

I would definitely put reflex sympathatic dystrophy or crps high on my differential diagnosis. It's a very disabling condition. Use topical analgesic heat physical therapy as tolerated. Bone scans and x rays of the joints affected.