Welcome to HCM
We understand your concerns
None of problems you mentioned are relted to medicine side effect or your bck problem. I can clearly suggest it as a psychological problem.
It seems that you are yawning excessively because you get bored too soon. You are interested in drinking. Whenever we are not interested in any activity, we get bored and automatically yawns and drift to dozing. Stop drinking and be active throughout the day. Consult a psychologist
. I can help you. Come with details through "Ask a doctor" link in this website.
Wish you speedy recovery