i am 5 ft 7 inches, 13 stone, and have arthritis, stenosis, and degeneration in my lumber part of my back. I have root block injections every few months. my back has gone into spasm again and have just been given a difene injection in hip. she has also given me difene 75 mg tablets to take twice a day. can i take one now or do i have to wait till this evening to take one, due to my injection?