You have begged God to save you and waited for a feeling to come that never does.(Feelings are not the best thing to rely on anyway.)
You believe you are a sinner Luke and getting saved is something a child can do,just Trust Jesus that His death on your behalf is enough.Accept that.
Don't worry about how to stay saved,if you are saved and you are struggling with sin,take it to the Lord.
Rather than getting medication get a prayer buddy,a trusted man to be accountable to.Be honest with him and pray together.
Christians struggle over their salvation and it maybe because of past sins,present sins or they maybe experiencing a satanic attack,even they maybe experiencing God prompting them to settle the matter forever.
I hope you find this helpful Luke.
Mrs Hayseed