One factor that influences muscle cramps is a mineral deficiency or an imbalance of electrolytes: magnesium, potassium, calcium, and
sodium. Migraine often occurs as a result of low brain levels of magnesium. One clinical trial found that supplementing with magnesium caused the complete elimination of migraine pain within 15 minutes in 80% of migraine sufferers.
Normal pulse pressure is around 40mmHg in a sitting position. Narrow or low pulse pressure is defined as under 30mmHg. Your pulse pressure is 20 to 26mmHg.
Causes of narrow or low pulse pressure include shock, tachycardia, left ventricular dysfunction, hypovolemia, mitral stenosis, severe pulmonary stenosis, severe aortic stenosis, constrictive pericarditis, pericardial effusion, ascites, cardiac tamponade, congestive heart failure, anaphylaxis.
Your symptoms could be related to a lot of different conditions. We don't usually see a lot of dizziness/nausea with thyroid conditions, but anything is possible. Your experience getting to the bathroom, sounds more like you might have gotten up to quickly or possibly and inner ear issue. Muscle cramps can be a symptom of hypo, but could also be a simple electrolyte imbalance.
The first thing you'd have to do is have some simple blood tests done. You need to get TSH, Free T3 and Free T4; along with those you should get thyroid antibody tests to rule out an autoimmune thyroid condition. Antibody tests you'd need are Thyroid Peroxidase Antibodies (TPOab), Thyroglobulin Antibodies (TGab) and Thyroid Stimulating Immunoglobulins (TSI).
TPOab and TGab will confirm/rule out Hashimoto's Thyroiditis and TSI is the definitive test for Graves Disease.
Did your thyroid ultra sound indicate whether or not you have nodules? Since the ultra sound reveals inflammation, you will need to keep tabs on your thyroid, whether or not it turns out to be the cause of your current symptoms.
Do you have any of the typical symptoms of either hypo or hyper?
Common symptoms for hypo would include, but not be limited to: weight gain, high cholesterol, dry itchy skin, dry coarse hair, cold intolerance, fatigue, muscle/joint aches/pains, depression, puffiness (especially around the eyes)
Common symptoms for hyper would include, but not be limited to: weight loss, intolerance to heat, diarrhea, nervousness, fatigue, rapid heart rate, palpitations, warm moist skin, insomnia.
If you are testing blood pressure correctly, and continue getting low readings, you should have a heart work up to be sure there's nothing there to worry about. Many pharmacies have a blood pressure machine that you can use for free........ you should try one of those (I've found them to be quite consistent and accurate), or have your doctor check your blood pressure.