Shannon,
First of all, I’d like to say “Congrats!” about your return to Yoga. It is unequivocally the very best thing you can do to heal your fibromyalgia.
Regarding your question about asanas that are okay for low blood pressure, fibromyalgia, and costochondritis all together - well, that’s a bit complicated. Even just the blood pressure question is complex. The answer depends on why your blood pressure is low and on whether or not you have had other medical problems like stroke, heart disease, or osteoporosis.
My advice is to find a qualified Yoga therapist to work with at least a few times. You can go to the International Association of Yoga Therapists website to find one near you. Or find an MD/DO knowledgeable in Yoga and work with them.
In general, if you have idiopathic (no known cause) of your low blood pressure and you don’t have other medical problems, then this is the time the proverbial “listen to your body” advice really rings true. If your blood pressure drops too low, you will feel lightheaded and dizzy. If that happens, stop whatever you are doing and sit down or lie down immediately - right where you are.
For someone with idiopathic low blood pressure and no other medical problems, the main concern is regarding falling. If you get lightheaded and dizzy, then you might fall - either because you pass out or because you lose your sense of equilibrium. Falling can result in broken bones, bruises and concussions. That’s the danger.
Prevent the drop in blood pressure and light headed feeling by:
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Maintaining hydration. Drink lots of water with fresh squeezed lemon or green tea before practice, and if your practice is the kind that makes you sweat, keep water with you at all times. This keeps your blood volume up so that pressure drops are less likely.
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MOVE SLOWLY. Don’t stand up too quickly. Don’t rise to a sitting position from head down asanas too quickly. Be very, very slow and careful. If you feel lightheaded, sit or lie down immediately.
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If you can, practice in a group or with a friend. They can help if you fall - or look like you are about to do so.
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Surround yourself with carpets, cushions, pillows - anything soft in case you go down.
Warm regards,
Kathleen