One thing to think about is carrying some level of a change of clothes. I typically bring a change of underwear, socks, and a dress shirt. If I cycle in shorts, I bring long pants as well. At work, I keep the following supplies: baby powder (talcum), food powder, underarm deodorant, a washcloth, a hand towel, and a comb.

My workplace has an unused office used for storage and they let me park my bike in there. Try to find a janitor's closet, unused office, or even a stairwell to store your bike. If you have an office with a lock you can change in there, or in my case the room where I store my bike has a lock. Failing that, you can change in the men's room.

I take a shower before I leave home. When I get into work, I lay out my work clothes, lock the door to the storage room, and undress. I then dowse myself in baby powder and put on the deodorant and get dressed and do the same with the foot powder and my socks and shoes. Believe it or not I feel more clean and fresh this way then when I take a shower and drive to work.

I think it's been mentioned, but especially with your condition it's important to get a good helmet.

Good luck. Once you start riding, you may not return to driving.