how to cope with anxiety

hello, rainbow mums to be. I hope someone has a good piece of advice for me. we had a mmc at week 11, but baby had stopped growing at around week 8. we're pregnant again (yay!) and I'm now 8+2 and so scared it could happen again. if I have cramps, I panic, if I don't, I worry. I'm trying to stay positive and I think I manage to at times, but I know that my subconscious is panicking as I 've been having nightmares for 3 nights in a row, now. how did you manage to stay calm and positive during thle week(s) you lost your Angel baby? we went for a scan last week and baby looked fine, there was a heartbeat and everything.but we didn't really have any scans for the previous one, so how can I know it wouldn't have looked the same? I have a reassurance scan booked on the 5th, how can I avoid this anxiety until then? on the one hand, I know our baby is fine, on the other I am so scared of losing this baby too. any advice? thank you all!