I don't even know what to do... I'm so upset.

I'm going to try and make this as short as possible. My cat just recently was spayed and it got infected so she had to have a big surgery to have skin removed and has to be on an antibiotic for at least 10 days. For the past 4 days I've given it to her every 12 hours like clock work just like the doctor said. Well Monday night I accidentally gave it to her 3 hours late at 11pm which meant she couldn't have it until 11am the next morning. Well I went to give it to her and my husband said not to worry about it he would do it. He forgot. 1:30 rolled around and I asked if he did it and he said he completely forgot and would wait until 3pm since he wouldn't be home until 3am and that way I wouldn't have to stay up late to do it. He insisted that I not do it and he swore he would. So I agreed. I texted him at 5:30pm to ask if he had given it to her at 3:30pm and he said he had. The next morning I asked him had he given it to her at 3:30 that morning. Again he said he had. This afternoon I left for work at 2 and he said he would take care of it. At 5:30 I asked and he admitted to forgetting so we got home and gave it to her. We have a security camera watching her at all times to make sure she is ok. I went back and looked at it for when I was gone. I always review it at the end of the day to see how she was during the day to make sure there are no concerns like straining to go to the bathroom, lethargy, bathing the affected area, etc. when looking it over I realized he never gave her the meds so I went back and checked the two previous times. Nothing. She is also supposed to be getting ice on the area twice a day and he swore he did that too. Nothing. He hasn't even opened her kennel in 2 days. Now tonight it is oozing. The infection is starting back bad because she didn't have her meds. I'm so beyond angry. She needed her meds. The infection could end up killing her without them. I confronted him and he lied and said the camera must have messed up and missed him doing it. An hour later he finally confessed that he forgot at thought I would be mad so he kept thinking he would take care of it and I wouldn't have to know and it would all be ok. He just kept forgetting. I am insanely worried about her. She is completely helpless and there is nothing she could do about it. She didn't choose this. She was forced to not get her meds because of his pride and fear or getting into an argument. I wouldn't have even been mad if he just confessed to forgetting. I would have done it and she would have been fine. I'm making him sleep on the couch because I'm so beyond upset at the situation. I can't believe he lied and put her health at risk just because he didn't want me mad at him. What do I do? Am I overreacting?