Getting off crutches

I have been on crutches for 15 months due to a huge flare up and now I'm feeling a bit better thanks to Cosentyx. I've started using one crutch but leaving both of them is very painful, both in my muscles and in my joints. I also feel insecure, because I've lost a lot of balance and I feel like I'm going to fall down. I've started doing very simple exercises, now that I'm able to, but the progress is naturally slow.
Have you ever experience anything similar? Any advice?