Hi Annie0710
I've been following this thread - what a traumatic experience you and Bert have had. I'm so glad things seem to be improving.
As a fellow cat slave, I did have to chuckle about you saying that you had to tape the cat flap open. This reminded me of one memorable winter where we had to do the same. One of our 3 cats is definitely intellectually challenged - no other cat we've ever had has had a problem with the flap but, as a youngster, this one just couldn't get it. Oh, that cold whistling draught which seemed to make your feet cold in the downstairs part of the house, no matter where you were .... We got there in the end, after my husband just lost patience, got firm and said he couldn't stand it any more.
Hopefully you have the medicine administration sorted now, but for the future, I recommend Webbox Lick-e-Lix which is a creamy-consistency treat. We find the liver flavoured one goes down very well (it smells disgusting!) and is good for hiding meds.