I don’t know for sure about this, but I think (maybe) that you can go off SSDI or SSI and try to support yourself and they will keep you on the rolls so that if you need it again than you can get it re-instated without having to go through the whole process of starting over and having to apply from the very beginning. You may not have to start from scratch again if you need benefits. They may be able to tell you this over the phone.
Also, everybody is right about a trial work period. I’ve had many of them over the years for many months at a time. After using my many months of work trial periods up, I now work part-time and I can still collect SSDI. I am allowed to earn up to a $1000 a month without it affecting my benefits.
Theoretically, I can do this forever unless I go over the $1000 limit even once. Then, theoretically my benefits could be taken away. BUT… my old boss told me that if it’s the employers fault that I go over (overtime, bonuses, back-pay etc.) than my employer can call SSDI personally and tell them it is the employers fault and SSDI will take that into account and not take my benefits away. I have worked since 1984 and I have tried supporting myself two times and failed. So I reapplied and got back on SSI and SSDI.