The only problem I'm seeing with your schedule is that you clearly have high expectations for your productivity, but you're not hitting those and then punishing yourself for that. This actually hits really close to home for me. For most of my adult life, I've had really high expectations of myself and what I can do in the day. But I could never quite seem to live up to those expectations, and I kept punishing myself which lead to more procrastinating and a deteriorating self-worth.
It wasn't until I took a step back and asked myself -- "Is my expectation of productivity for myself realistic and in-line with my life goals? And do I need to be as productive as I currently want to be to achieve my goals?" -- that I realized that my expectations weren't in alignment with my goals and what I really wanted to do. I found that I was sacrificing my social life in particular (and sleep) in this ridiculous pursuit, all the while losing more time every day to procrastination cause I wasn't being honest with myself.
Maybe your body and mind are telling you that you need to give yourself some time with lower productivity standards to decompress from the stress of your former employment. Maybe you just let yourself sleep till 7 (hell, this is still early man) and enjoy the rest, cherish it? Maybe you allow yourself to ease into your day, take some time to read a few articles here on Medium or watch some YouTube while you eat breakfast and wake up fully? Maybe you cherish the time you now get to spend eating with your fiancee or watching TV with her instead of expecting yourself to be productive all the time?
As long as you are able to pay your bills every month and put money forward into investments to grow into the future (whether you "retire" at 40 or 50 or 65 or whatever), then stop stressing so much. Keep in mind that if you managed to get just five high-quality work hours into your day, you're probably ahead of 95% of people out there. The key is high-quality.
And then as long as you allow yourself to enjoy your life at a little slower of a pace, I think you'll be much happier and probably never regret leaving your employer ever again (except when you miss the camaraderie, that's tough to replicate).
