Hello, Very Well written. I, also am worried about tomorrow, but as Sun Tzu pointed out, if you know what ground you are standing on, you can take advantage if that.
I am for the most part, a long term holder of stocks, BUT I do, if a stock if up a good bit, take 30% or 40% of my position to "stop loss" and then, do as you did, buy more back lower.
I don't find that stressful, I find it rewarding because I'm making extra money. To me, Stressful is just watching it go down without a plan and doing nothing about it.
ABOUT tomorrow, set yourself up to take advantage of the situation.
Do you have extra money?, put in limit orders to buy MRKR and/or others at a MUCH cheaper price just in case it's get crazy.
DON'T have the extra money? Do this? Raise money like this?
Take some stocks that you have the Most Profit in, and enter a "conditional" order, a "one triggers another" order.
Order #1, Put stop losses on stock a, b, c, etc., at JUST BELOW it's current price.
Order #2, Put in limit orders to buy MRKR and/or others at a MUCH cheaper price just in case it's get crazy.
If the first trade get executed, it automatically triggers the 2nd order.
Good Luck