If pain medications are increasing your nausea, then you have severe acidity and reflux. Take a late night snack. Raise head end of bed. Take Omeprazole empty stomach in morning and an antacid gel at bedtime. Refrain from smoking, alcohol, fuzzy drinks, caffeine, and spicy food. Cold peripheries or cold hands and feet can happen due to peripheral vascular disease or disorder of the circulatory system outside of the brain and heart. Other causes of cold extremities are hypothyroidism, eating disorders like anorexia, Vit B12 deficiency, Addison’s disease, adrenal causes like pheochromocytoma, anemia, Buerger’s disease, chronic fatigue syndrome and Raynaud’s disease. You will need some tests like treadmill test, color Doppler, angiography, ultrasonography and MRI (magnetic resonance imaging).
Since I cannot examine you and know other related conditions you may be having, nor is a detailed history possible on net, I have listed the various possibilities that should be looked into. Please consult your PCP to run tests and examination to clinch a diagnosis.