I also experienced losses in 2017, I saw my entire portfolio in the red and I despaired. But with the passage of time and having studied the market, all those feelings have disappeared. You learn when to buy and when to sell. You learn when to risk and be willing to lose. I would say trading is 80% psychological and 20% technical, it is something that must be trained and to do so, you have to live the losses.

In my personal opinion I think BTC is just correcting and that is a good thing. It would be bad if it went up non-stop and never corrected, it would be practically a bubble and we don't want that. We have to be patient and stay calm.

The altcoins will be affected whenever BTC goes backwards. It practically drags them down with it on the upswings as well as the downswings.

Best regards!