Mary you're getting a lot of "i don't think so's" instead of "I haven't the slightest idea". Here's one study on nitroglycerine after surgery
sciencelinks.jp/j-east/article/200212/000020021202A0405017.php
He should be getting something for his nausea...that is quite common with this surgery...phenergan is one of them but with his spiking blood pressure i wouldn't recommend it. Zofran another which is used a lot in patients taking chemo and if anything this one reduces blood pressure. However, if he can't keep anything down at all and is vomiting i might suspect an ileus. Keep watching him.
www.drugs.com/pdr/zofran.html
I would talk to the social services person at the hospital as i'm sure your husband is going to need Physical therapy and probably a transfer to another facility that provides that is not on your husbands agenda as he wants to go home...but maybe they can provide at home care? See if they can help you.
If he has that much mucus blocking his main tube i question why they would take it out so soon...it needs to be irrigated daily. I had mine for 3 weeks after i got home.
Hope the other guys can comment on that one.
Wish you both the best Mary.........Pat