Congratulations!!! Getting through the first few days is the toughest bit, IMHO.
No other tea - mint and the laxative tea only
Keep taking any medication you think is needed - disruption for cleansing can make bigger problems than continuing while you cleanse - a short cleanse 10 days or less you should have no problems.
You absolutely need to drink the minimum of six 10 ounce lemonades as written in the book - otherwise you will not ensure a successful outcome and could hurt yourself. If you don't love lemonade, this is not the cleanse for you.
Having doubles (20 oz) three times a day is so doable.