I've thrown up 4 times today all medicine and fluid and now I can't keep anything down now I throw up reddish brown stuff? What should I do.

Go to the ER. Bleeding (what i suspect is your "reddish brown stuff") is never normal, ; warrants urgent evaluation. If onset is acute, accompanied by lightheadedness, bleeding is brisk, you have a bleeding problem (or are on blood thinners), can't hold anything down, and/or you have considerable abdominal pain, then get to the er now please.