Don't be sorry, they're perfectly reasonable questions!
So without going into too many details, physics last year was pretty bad. i.e. teachers couldnt teach very well, staffing changes, the big jump from gcse to a level, having to go about this with little support. How I overcame this was about this time last year when I simply taught myself from the specification. This may sound weird but from my experience, as far as A level physics goes, if you learn the specification inside and out, you do relevant questions to the specification, you think about what they could possibly ask, etc you realise that you can actually do really well in physics A level without necessarily being a genius in physics, because you know the system and how to get marks. Not saying you should teach yourself from the specification but that really helped me at least. I think the hardest thing about physics is that teachers can overcomplicate things and when you learn new content you can be really thrown, but as long as you're aware of the things you need to know, and the things you don't need to know, you realise it's actually a lot more simple than it appears, at least as far as your exams go. It's still hard though and requires effort, I'd be happy to help if you have anymore questions about it.
Regarding the degrees, they're all very good and will lead to great jobs if you're interested in the fields. Personally, I've applied for electronic engineering, because I wanted to be involved with developing technology and there's lots of future potential in the field in my opinion. It's also considered by many as the hardest and most 'mathsy' engineering course, although there's not much in it between the other engineering disciplines. There's also the option to go into physicsy fields (e.g. nanotechnology, photonics) with electronic engineering so I can do some physics stuff as well which is what I wanted so I'm pretty happy with it.
I don't really have very much of an opinion about the other engineering disciplines, the main ones we haven't discussed being mechanical and civil. Nothing against them it just wasn't personally what I had an interest in but as far as career prospects go, they're pretty solid throughout all of the fields. I personally like how doing an engineering degree allows you to go into a rewarding field, yet also allows you to go into a related PhD so you can do more of the science research if you realise that's more your thing.
I would strongly recommend going to as many open days as you can, even from universities you may not consider strongly, as they provide so much more information than what any website or even promotional video can. You're doing really good A levels so you can consider going into any of maths, science, engineering, computer science even. It's easy to rule out a subject because you're finding it hard but that may change in a few months, it did for me at least. Good luck and let me know if you have any other Qs