Can I use a mobility aid?

Hello, I have been dealing with fatigue for years now and have been having extreme fatigue to the point I can’t stand for 5 min can even sit down and do my makeup as I get tired and my body begins to feel heavy. My dr thinks it may be pots however has also suggested a possibility of MS as well. He didn’t really give me anything to help with my symptoms only a beta blocker that does basically nothing as my heart still goes up and I feel so tired. I get dizzy and experience weird facial sensations at times whenever I get little dizzy spells. I’m not sure what to do. Based on this can I get a mobility aid? I’m a allowed to? Please I need help and won’t get answers until November.