GERD AND SEVERE HEARTBURN. Do asap.

I am suffering from extreme heartburn. This problem has existed since the past 2-3 years but it has aggravated to another level in the past 5-6 months. I haven't consulted anyone till now about this even though my condition is severe to say the least. There was this one day in March when due to food poisoning I was vomiting but instead of a normal vomit, I vomitted a huge amount of blood with it. That left me extremely weak and in a very bad condition but it improved after a couple of days and I was back to my routine. But the heartburn increased so much that I would have a stinging pain in my chest and I would have to sit down at a spot and drink a lot of water and let that pain subside. This became an everyday, heck an every hourly thing. Recently it has come to such a level that my weight has reduced from the constant 55 kg to a new low of 47 kg. I have had to severely reduce my diet and eating anything gives me a huge amount of heartburn. Please advice as to what I should do asap.