I don't know if I should exercise or not and more.

Please read before responding. Even if you just skim through it quickly, that's fine, too.

I am on my period, have been for a while... still lost some weight.

Also, I am a phentermine user. I have not been able to lose weight even on a diet before it. I am not sure if I should be taking a break from it or not, but I am. I did not take it today because I've been sick and I don't think it is safe to take if you aren't well.

I am having horrible headaches, dizzy spells that are so bad that I lose control of my muscles and fall down. It isn't from too low blood pressure, it's from being amazingly stressed and horribly depressed lately. I am going to therapy, yes, but it can't fix it overnight, obviously. I don't think I am getting enough oxygen to my brain. I am not sure what to do for that, either. I feel extremely weak even if I eat right and everything. It's very annoying for me. I tried taking a high dose of B12, made the headache worse, so I won't take it again for a week or two, at least. It was a dosage over 5,000% of what you need or something crazy like that. I don't remember now. I think it's safe to take one here and there, though. I do have a deficiency and that became obvious when even on the first day that I took it, I was able to talk better by being able to build conversations in my head. I was also able to recall vocabulary at a much, much, much faster rate. I was able to read properly and have more of an understanding of what the thing I just read was about. I slept better at night, too.

I have a lot of muscle pain, so I started taking a potassium supplement today.

I have been doing everything I can to get a minimum of 30 minutes of exercise daily. I haven't done anything today. I feel horrible.

Should I exercise anyway? Also, I almost never eat over my calorie goal. It's very rare that I do. I am usually way under because I don't feel very hungry when I am so, so depressed. I do all that I can to get as much water as I possibly can, but today, for some reason, it has been very hard to get the recommended amount of water even... it wasn't any trouble at all before I really crashed from being so upset. There's like so many problems in my life right now.

But yeah... should I exercise? Sorry for the annoying topic.

Thank you for all answers.

EDIT:
I have been over this on more than one occasion.

Also -- it is NOT from phentermine. Phentermine actually made me feel a million times better the first week. But I stopped for two days and started again while horribly depressed.

The dizzy spells and all have been going on since 2008 or 2009. No one can find whatever is wrong. There have been leads, but they can't determine what exactly it could be. One more thing that is vital... it does not happen if I am not stressed. One of the leads is that it could possibly be some form of panic attacks. Another lead is that I could be developing multiple sclerosis. Yet another lead is Cushing's disease due to elevated cortisol. All are hard to diagnose.

So..yes, I have been to doctors. I am still going to more.

EDIT:
I hope I will still lose weight even though I will stop exercising until I feel better. Thank you all very much for helping me with this decision. I like that this community is caring and nice about it instead of being crabby and rude. It makes things much better.