If you've been really trading for more than a year, you should definitely know that this drop is only going to be temporary
I've watched a few $100 drops before, but a few things are different this time:
A) I never held enough for it to affect me too much
B) My alt bags used to pump when BTC dropped
C) This is REALLY starting to feel like a bubble
It's the last one that killed me as I'm not sure how the bursting of said bubble would affect my bags long term.
With that said,
I think it's a mistake to assume BTC will do nothing but rise in the future.
Yes, it was a huge error of thought on your part to have reasoned that way. Every businessman makes provision for loss such as what you are experiencing now. It's part of business and a crucial part of profit making/sharing. It shouldn't be all rosy at all time. Even with the current position of the cryptos, it is most likely the coins will further depreciate till the end of July.