This is always happening to me most of the time, I sell my coins when the market is in downtrend especially when I really needed it or emergency purposes. I cannot blame the market but to myself the outcome of my decision. Yes, it is my decision so there is nothing to blame but myself when the time I will regret selling.
You shouldn't regret such decision. You said so yourself, it's an emergency, I don't know what it is for, but for example to save someone's life, or due of a payment or something. Whatever it is, as long as it's an emergency (urgent), or any significance at all don't regret it over money. Why? Money can be earned again and again--life(?) you can't, time(?) you can't.