yes, you can always come back to Qatar. provided you are not banned from entering Qatar. if you have not committed any crimes or violate any rules here, sure you will not be banned from entering Qatar.
no, you will not be able to work with any employer, since you are not given a NOC from your present sponsor. you will be banned from working Qatar for 2 years (if i remember, correctly).
let me answer you more accurately.
yes, you can always come back to Qatar. provided you are not banned from entering Qatar. if you have not committed any crimes or violate any rules here, sure you will not be banned from entering Qatar.
no, you will not be able to work with any employer, since you are not given a NOC from your present sponsor. you will be banned from working Qatar for 2 years (if i remember, correctly).