Unlikely to be related in any way to the steroid injection - when U say that U reacted badly to, what happened?
I suspect vaginal atrophy - as oestrogen levels drop the body may become dry: inside and out; skin, deep in the ears, nostrils, scalp, vagina ....... as well as muscles becoming lax = aches and pains.
Get yourself some appropriate VA treatment from your Nurse Practitioner. 'vagifem' is a pessary inserted into the vagina every night for 2-3 weeks; 'ovestin'/estriol the same, every night for 3 weeks. The first can be inserted and the latter smeared around the vulval area to keep everything soft and supple.
Some use 'sylc' or 'yes' products .......... I find that estriol plus KY jelly or estriol on the outer areas works for me. If I get the need2P symptoms I swallow 2 Nurofen to ease the nip as the urine flow shuts off.
Let us know how you get on.