I had what the doctor told me was cortisone injections on my scal...

I had what the doctor told me was cortisone injections on my scalp and elbows for psoriasis which i later found out was kenalog...i now have had my period for 4 weeks ..i got my reg. period on feb.5th then went to the doctor and got the shots on feb.14 by feb21st i started my period again and haven't stopped after going to my obgyn and having many test that all have been fine . the first 2 weeks after the injections i had lower back pain, headaches the lower back pain is now gone but i am still getting the headaches every now and then. when will this all go away and it would be really nice if the doctors told you about this ...i take med. for high blood pressure and asked my doctor if this was safe ..he told me yes i have been back to the same doctor just last week who told me he has never heard of this happening how is it that we all are having the same things happening and the doctors say they have never heard of this happening?