Hi there -
I have a couple of thoughts for you. I'm sorry the facial palsy has set in. I don't know how long it will last, but wait patiently. Nerves take a long time to heal - sometimes weeks or months. (I know, not what you want to hear!) The specialists generally urge patients not to do too much too soon. I would encourage you VERY strongly to see a specialist about your eye. Your facial nerve stimulates tear production, and without them you can really do damage. I use an ointment in my eye when I'm not using a scleral lens. It clouds my vision, but protects my eye. You can read quite a bit on this forum about eye care and you'll probably needs to try several gels, drops or ointments to find which works best for you. I use Refresh PM day and night, plus some cling wrap around my eye at night to protect it. I love my scleral lens during the day and it might help you if your eye needs help for an extended time. You can read a lot on this site and on the web about options.
I had very little pain after surgery, so I wonder if you should contact your surgeon to make sure all is well. I did sleep with my head elevated for quite a few weeks. You may try that.....and I wouldn't hesitate to contact the doctor if that doesn't resolve.
I had more of a metallic taste for a bit, but it wasn't too bothersome. Have you tried moisturizing mouth sprays or rinses? Your facial nerve also works your salivary glands, so your mouth may be a bit drier than usual and that could be part of your taste issue. Again, others may be able to offer more than I can.
Our recoveries are all a little different, so I'm sure others will have helpful thoughts to add. Remember that your body has been through a lot. Give it time to heal. We certainly wish you a successful recovery!