I feel like crap (30M)

30M. I've fluctuated massively in weight for the past decade plus. I'm now at the heaviest I've ever been at 335 lbs. Medication, anxiety, food addiction, and just laziness has led to this. I started getting sleep apnea and I'm just exhausted 24/7, so I've decided enough is enough! I don't want to die early. I'm 2 days into my weight loss journey, but I'm already finding I'm feeling like crap. I calculated my TDEE and what my deficit should be to lose 2 lbs per week while counting my calories with an app, but I'm feeling very fatigued, lightheaded and woozy before eating, and I have heavy brain fog (even heavier than what's generally caused by my anxiety meds). My last blood test last May indicate im not diabetic and I don't have hormone or thyroid issues. Should I slow down or what else can I do to make this journey more bearable?