I'm so sorry you had to go through that, but I'm glad your Father is alright now and everything's back to normal. Don't worry about your fall of the wagon, just put it behind you and get back up again. Remember that exercise and healthy eating never gave instant results, and you need to let your body get back into its rhythm after your change in diet and exercise!
Most of all remember that you can do this! You've shown yourself to be a very strong person by what you've been through, and you have a lot of support, both here online and I'm guessing in your family too. Never give up!