Today I'm thinking of selling my BTC even though it would be a big loss right now I've been with BTC a while and used to the volitility but this time I believe it's different
Well, if that's your final decision then so be it. Who are we to stop you anyway? I just hope you won't regret this after looking on btc booming in the future. I wonder why you lose hope and have negative feelings suddenly. I presume you are btc investor for a quite a long time already so why backing out now? 
Now I feel that BTC will trend down hitting sub 1 dollars prices possibly even 0 over the next 12 to 18 months.
Uh uh uh 
, not that fast my friend. Okay let's assume that btc will fall that hard in the future (though for me it's slightly impossible), I don't think it will happen within a year. The worst bloodbath I saw was on 2017 and yet btc survived, then what more during these times?