poor service

frustrated and disappointed, started to get sick since 2016 went to the specialist which is under discovery network, but he could not diagnose me went there until 2018. this year my GP initially send me to another specialist and the doctor find what was wrong with me, but now i am supposed to do a procedure but wast told by medical that they wont pay for me i would need to make co-payment of which i dont have money, now they are forcing me to go back to the first doctor who did not care about my health. what should i do, i am stuck and this things is getting serious.