Whatsapp changed number gone wrong

Hey , I changed my whatsapp number to my new number , got the text and everything went well and I finalyl changed my number on whatsapp, But than I noticed im not saved on everyone contact list and im not in the groups anymore while my previous number is still in the groups . What to do ? Im lost! I can't switch back to my old number because the sim is not active anymore and I cant recieve sms or phone calls in there. Now I have new whatsapp account instead of transfering my old number to the new number.