It’s probably fine for you to fly now if you don't have any breathing problems. But to be on the safe side I think it would be sensible for you to check with one of the health care professionals looking after you, such as your lung care nurse or GP, who are familiar with all your medical details and will be better placed to tell you for sure.
I hope you are able to get away somewhere soon. Gives us a ring if you would like to talk things over. The number to call is Freephone 0808 800 4040 and the lines are open from 9am till 5pm Monday to Friday.
