I sick and tired.ppl.help?

im 17 i have been having backpain for a month now,and now it hurts more its like this pan in the midle of my back and it passes like true my ribcage and kind of get nausious. In the morning wen i wake up i feel sore and my back starts to hurt and my the upper part of my stomachk hurts like if i had gas and i still burp,and i try all these medice and it just wont work its still there, and it goes and it comes back..what could it be for a month and i notice that i ganed some wight too..so now im getting tired of ppl what could it be has anyone had the same problem that im having..tell me..pll



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