Hello Anna and welcome.
Therapeutic issues are tricky critters to address and that is exacerbated when we do not have actual contact hours with the student. And since there’s a cross-section of backgrounds one is likely to get a myriad of replies. I would also be curious if you are on meds as all pharmaceuticals have side effects and that would be critical information for me. But I’ll presume “no” since it’s not been mentioned…
Since you are a beginner my feedback is relative to that stage of practice.
Lupus-like issues are autoimmune issues. Since the body is basically attacking itself a quiet, calming, nurturing practice that does not light up the immune system is warranted. The blood pressure should not be elevated by the practice though in some poses that is the case.
Movement allows for toxin release. The body naturally purges itself through several mechanisms through our day/lifetime. So this is already occurring but has been embraced as part of the Yoga Propaganda machine. It is not untrue, it is just over used, over stated, and overly convenient.
Yes some additional work may be freeing things you’ve been carrying and that can cause some nausea, lightheadedness, headaches, et al. But it is not the ONLY explanation. The practice itself may not be appropriate for the person doing it. Since you’ve not mentioned what you are and are not doing it is impossible to say more.
Cramping can be a mineral imbalance. Some find a magnesium supplement to be helpful. If you are savvy you can find magnesium-rich foods and add them to your diet. It is also possible you are not fully hydrated. However it’s grossly inappropriate for me, as a teacher of yoga, to assume (or assert) it IS this or that and tell you so.
Water, in order to be deeply hydrating, has to have something in it otherwise its primary function is flushing the body. Please try some fresh lemon or lime juice in your water, consume half your body weight in ounces each day, and avoid caffeine to see if the cramping abates.
And, of course, never mistake this sort of feedback for medical advice.
Hope this helps.
gordon
