okay, i dont know whats wrong with me, i'll list my symptoms?

two days ago i was downtown and i got this HORRIFIC headache out of nowhere, i assumed it was a sinus thing so i took some tylenol and let it go, i woke up yesterday morning and my head didnt hurt as bad, but it still hurt and i walked out of my room and this horrible churning pain in my stomach hit me, and i started throwing up stomach acid EVERYWHERE... i was immobile for about half an hour, then after about an hour, the churning feeling was gone, but i felt like i had this knot in my stomach and it moved toward my chest, and the knot pain has been in my chest area since yesterday, well about thirty minutes ago i threw up again, but i didnt feel like i needed to it just happened, and the liquid was this redish color *not blood*, it looked like iodine actually, well it tasted bitter, not like acidic bitter, but like basic metalicish bitter. and after that the knot felt like it went down a little, it was amazingly unpleasant to say the least... does anyone know what could be wrong?