Which one do I qualify for? medicare medicaid medical?

Well I lost my job due to an accident and I haven't been feeling myself. I get anxiety attacks, short breath, body tingling, fatigue, sleepy, light headed, headaches, and full easily after a meal. I don't know what wrong with me so I want to know what do I qualify for? I am 23 years old male and well I went to the so called "good samaritan" clinic and all they ask is for money on the spot or medical, medicare, medicaid, or health insurance whatsoever :/ Well any advice if you were in my shoes? Please let me know and thanks in advance :)