FFF - welcome to the club! When I was trying to learn IMC, my brain used to get fried and I was just dishwater after a 1 - 2 hr IMC session. For most of my IMC training, I was in genuine IMC (no foggles used at all) and for some sessions, I didn't see a horizon from about 300ft AAL until on finals. I started to get the hang of it, but then had a break due to some issues with the club I was at. I also found that having 3 different instructors (not my choice!) and minimal ground brief / de-brief was not a good way to do it. I used to fly straight through the localiser beam (when told to report 'localiser established', call 'beacon outbound' when I was on the final hold and all sorts of poo like that!).
I must get back and current with it - a 3 year break means I'm probably back to square one.