Employment and health issues.

I started a new job back in August and I have accrued 12 sick days for various reasons.

The most recent is two week for lower back spasms where I couldn't walk no more then a couple of steps, can't bend  and in considerable amount of pain.

I am due to see a doctor who deals with backs tomorrow as a stop gap between my referral to a back clinic.

I am still struggling to stand or sit for long period of time and still need pain meds.

The doctor may or may not advise me to return to work.

I work in a nursery looking after toddlers and I do feel I'm putting myself and the children at risk, if a child falls over I can't bend to pick them up! 

Also long hours on my feet (10 hour shift) and very physical.

I am concerned they will dismiss me and another employee has just been dismissed on the grounds of her health rather then supporting her, I am left anxious about my return, wondering if I'll make myself worse or if I'll even be supported by management.

Makes me feel like jacking it in. Do I go on some kind of health related benefits even if it's for a short time? 

I don't even know what other job I could do, teaching early years has been my life for 20 years ,

Any help or advice appreciated