Chemical Imbalance due to Over Masturbation?

Your masturbation may not be the cause of your feelings. You had a change of cl with a change of friend. It is more likely that this is the cause of your feelings. Since this may be a bit of stress until you adapt to new friends you might cut down on your masturbation to once a day. I doubt you have changed any chemical balance in your brain. Worry is a bigger cause of altered brain chemistry than any masturbation you can do.