What Causes Light Headedness, Nausea And The Urge To Defecate?

Hello, on Monday night I had a case of acid reflux, bad, never experienced this before. Created a lot of coughing, raw throat and headache. Took aloe Vera juice, apple cider vinegar/ginger drink, and am drinking 9.5 ph mineral water. Felt better; then, feel like a head cold is coming on. After dinner and eating some dark chocolate, took my Vitamin D supplement, red yeast rice, Vitamin C, and a mucinex (12 hours). Was standing and became light headed, felt nauseated, and sudden urge to go to the bathroom (poop). I have not vomited but did have a movement. Husband mention possibility of gallbladder problem. I am not in pain but the lightheadedness scared me. Thoughts?