Soooo scared of goin down hill :(?!

Iam sooooo scared of going down hill with my anxiety again, I had 3 weeks of really good mood, positive happy content ect... But in the last few days I've gone really down hill again, anxiousan overwelming feeling of I can't cope, anxious thoughts and weird feelingsan just wanting 2 cry and break down... I know iam not bi-polar as I have been tested but I just need some advise as to how to stop myself from letting myself slip... I can't go trough that again :(