Hi Talia,
I did a quick internet search on the machine that you keep having used on you and the following seemed relevant. From the web info, which could have been posted by anyone, it seems that the purpose of the machine that has been used on you is to
1. Stimulate peripheral nerves for the purpose of providing pain relief.
2. For complex and chronic pain conditions.
3. For adjunctive treatment of post-traumatic pain syndromes.
4. Management and symptomatic relief of chronic (long-term) pain.
However, I also found, as far as I can gather, that :
1. Electrical stimulation of the skin does not help with pain from the central nervous system.
2. The machine is purely for symptomatic relief and does not act as a cure in any way.

The way that I read the above is: "The machine's only purpose is to relieve your symptoms, so if it is causing pain then it isn't working."

Even if you find that the doctor with the machine is helping, I would definitely get a second opinion. Another doctor might suggest some drugs that might help with pain from the central nervous system. I mentioned before that I had something similar to you and I found electrical stimulation didn't help at all, not even for temporary relief of symptoms. However, I did find that 10 mg of Amitriptyline every night did help a bit. Perhaps another doctor might try something else.

And whether you are 25 or not you have to stick up for yourself. This is something serious that you've got, so don't worry about hurting anyone's feelings. If your doctors aren't helping you just walk. Taking someone along with you might help. Is there anyone sympathetic who could help you to sort this out?

Best of luck.
CS