Kenalog and time please

i had seasonal allergies all my life (47yrs.) and took over the counter allergy meds. Suddenly, 8 months ago, my allergies became severe - eyes constantly tearing and itchy, nose itchy and runny, roof of my mouth and even my scalp was itchy. The dr. put me on Zyrtec and Optivar eye drops. They seem to have helped but he sent me to an allergist who told me he was going to give me a "shot" to shock the allergic reaction out of my system. He said a minor dimple at the site for a month would be the only side effect. It's been a week and a half and the shot did nothing, suddenly I realized it was Kenalog as I remember hearing him tell the nurse which shot to prepare. Now I'm panic stricken after reading all these horrible remarks from the poor people who've had this shot and are suffering terrible side effects. I do not know the amount of med. i received in the shot but i have to go back in one week to tell him the results and if they're not favorable he will order bloodwork to help pinpoint my allergies. I am so upset that they did not inform me of the serious side effects that I have read on your site. Thank the Lord for help from all of the day-to-day people that respond to this website. I will never let a dr. administer anything to me without being better informed. Does one shot cause all these muscle killing side effects of the buttocks? The dr. called it a small dimple??? Greying of the hair - loss of hair - are these things because people have been taking shots over long periods of time? please help....