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Yes exacerbation of depressive symptoms is common whenever drug is changed. It also show that prozac was effective in your case.
As you are responding poor to treatment, there is need to find cause of poor treatment response, like:
-Biochemical and hormonal
imbalance: need evaluation specially for thyroid
-Vitamin deficiency: as you have unusual inner sensations
-Excessive stress in life
-Substance use: stop it if present
Apart from that aerobic exercise
, effective time management, breathing exercise
, healthy diet and yoga will help you.
I hope this information has been both informative and helpful for you.
Wish you Good Health.
Dr. Ashish Mittal