Sorry to hear that friend. If you are not doing this full time then you should always have a trade plan every time with stop lost. Don't be greedy and sell when you have profit. Your trade plan should always have an entry point and an exit point for both red and green. Mine is usually 10% max but there are times that I break that rule for longer swing trades. To win in this game is slow and steady.
Also be courteous to your fellow traders and always sell on the ask and into the strength. If you sell a big position when you met your goal while the ticker is going up then you just ruin the momo for the remainder traders.
Yes it is a dog eat dog world but everyone here has the same end goal. I am a firm believer in karma.
I hear man, I'm down 25k myself in all my weed plays. I just have to keep believing the talk about the sector in its infancy not yet realized its value. I've got 5k left it's staying put till the market can figure out where it's going. Or that's it for me too.
Try to hang in there... I'm in the same boat. Went fron 59k to 7.9k in the last month or so. I believe this stock has a lot in store for us shareholders.