It also might help if you open your diary and make it public so we can see what you've been eating.

It is very normal to yoyo daily. The number in the scale has way more items than just fat controlling it! Keep it up and you will see an eventual downward trend.

How's your hunger been?
10 days is early and you may still be hungry enough to be eating frequently and that can cause overeating in general but usually hunger reduces and you naturally begin to eat less frequently and less in general. You may not be there yet. Couldn't hurt to track everything just to see how much you're eating for reference.
If you're drinking any calories I'd kick those to the curb.

Weight fluctuates, it just happens. I would give it some time 10 days isn't very long in the grand scheme of things. I know I didn't become overweight in a short period of time so in that sense I didn't expect to lose weight quickly. I don't eat three meals a day but I try to make sure I am getting enough calories while still maintaining a caloric deficit. I guess I have always been IF and didn't even know it. I typically don't eat breakfast so I go from 6:30pm to 11am the next day without eating or if I do its something really light like a serving of nuts. My main go to drinks are green tea, regular tea with some lemon, water with lemon, and coffee with half and half in the winter time. I don't use any sweeteners except for the coffee so you might try to slowly reduce the Stevia and see if that helps. I drink Hibiscus tea if I want something tart with no caffeine.

I do exercise which has helped a great deal. I know you mentioned you can't exercise but if you can find one thing that ups your activity level without affecting your conditions it could help. You might try talking to a physical therapist to see what would be right for you. Just remember to listen to your body and don't over do things.

Overall the scale will yo-yo on you. I wouldn't stress about it. You might notice tight fitting clothes not being so tight anymore or your energy levels and mood getting better as you adjust to this WOE. Also get a good night's sleep, worry less, and maybe meditate more, those things are just as important as making a decision to go LCHF.

Also, with the chronic health conditions you have, your body has to fight off inflammation and work to heal. You may feel improvement in those areas up to 6 months before the scale starts moving. You might want to work towards focusing on NSV's as your primary marker of success. NSV's are NON scale victories. Losing inches, reducing pain, reducting medication, increased mobility, improved mental clarity, more energy, lessened (or increased, depending!) appetite, cravings for healthier foods, reduced sugar/starch cravings or reduced binge eating episodes, shinier hair, less hair falling out, slimming face, etc. There are literally hundreds, if not thousands of NSV's. The scale lies. Especially when you add in factors like Fibro, etc...