How do I get back from being extremely behind without help?

So.. I just got a game where I got 3 man ganked as top lane (Jungler, mid and support all came top) I pretty much made toplane get 3 lvls ahead of me cause they chased me for a long period of time. After I came back to lane I died to my lane cause I was so weak he could easily dive me. Then The support and jungle kept coming top to dive me over and over. How do I deal with this? Simply not getting tilted and hoping my teammates win the game? Didn't work my teammates were losing and I kept trying to be calm even if it frusterarted me way to much. My mid and jungle ignored me completely in helping, so it was pretty much impossible for me to do anything, all odds was against me. What do I do?
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