Your doc should only monitor your blood levels monthly for a short time. He just wants to make sure your levels are stable so DONT play around with them. You are 40+ so learn patience grasshopper.
After a short time, maybe 3 months he will most likely change it to ever 6 months then after 1 or 2 years he will check you yearly. I am at the yearly mark as of the end of January.
You dont want to try to play around with it monthly or he will just keep testing you longer due to the up and down. 6 months is hard enough to time everything good so you are back to normal 100%. Dont mess with a good thing.