your cysts are cleared with treatment which means you have to continue the treatment until your cycles become regular and your doctor says that you can stop taking drugs.
Reducing weight will help in regularizing the cycles. You can do brisk walking daily or at least 4 times in a week for around 30 mins which is easier way of decreasing the weight.
You can practice yoga
You can also take the help of the professionals trainers regarding this.
Worry will increase the menstrual irregularities by causing hormonal
imbalance. So, don't worry solution will be there for everything.
Now what you have to do is try to reduce weight, once again visit your local gynecologist tell regarding stoppage of drugs and follow her instructions.