I've been riding for a couple weeks after years of not sitting on bike in order to strengthen my health. I've been commuting to my work and school (12km/7.45 miles from my home) about three days a week and then resting/waiting (because of seasonal rains in my area). About three weeks ago I've started to feel ache in my right forearm in area highlighted in picture and it continues to ache for a couple more days when I lift something heavy or twist my hand or sometimes even without cause. After about ten days it has gone, but when I got on bike three days ago again, it has started again. Sometimes I also feel numbness or cramps in fingers in my right hand, but when I take off my hand of bike and stretch my fingers for a couple of seconds, it will go away.
Any suggestions what could be the cause of the forearm pain? I will see my local orthopedist in a week, but I don't trust him much as he is pretty lazy to even properly diagnose something. The only thing that has crossed my mind is that my handlebar is too low for me.