Oh blanco, I feel for you hun. Mine is both sides but by mid morning I'm feeling it more on my right side. Walking is really challenging, stairs are a big issue (and I live in a top floor flat), getting in and out the shower too. Sitting, standing (I can stand for as long as it takes to peel one potato!), walking... it's all horrid so work is going to be fun! The crutches do help, both by taking weight off (I was holding onto things as well) and by reminding me and others that I can't do as much. I'd go to the gp if I were you and ask for a physio referral. I think I've figured out the support, and have a nexcare back support too that I wear.
Physio did say gentle warmth (wheat bag/hot water bottle) is fine as long as it's not boiling hot, and need to sit with hips level to or slightly above knees and feet flat on floor. Will see if I can find a suitable chair at school on friday...
Take care xx