I Haven't Been Feeling Too Well For Almost 3 Years.

I haven't been feeling too well for almost 3 years. It started as I felt tired and then I started isolating myself, then I kept pushing myself and pushing myself and now I feel like a rubber band that wont go back to its original shape. My heart is beating fast all the time. I started having this anxiety feeling, then I felt guilty bc I was falling apart and about to get married.....I haven't felt like myself in a loooool time. I've been afraid to get help. I don't want to be locked in some psych ward but I feel like I need some help. I've been to a regular dr and a psychiatrist. I can rarely leave house. I cry alot bc I feel so sad and unable to ger out of this hole. I've never been diagnosed withave any serious psychiatric disorder...just depression. I'm scared to get help but idk where to go and I don't wanthink to be overly medicated. I just want to get better:/ I'd prefer to do it at home also. I feel like I may have smg medical things wrong though since I've been running around like this for so long. I feel like if I let go my whole body is just going to collapse from exhaustion. What do you think is wrong with me and what can I expect in terms of treatment?