New here! Need help losing weight

Decided to come here since most people here know there stuff and would like guidance and hopefully get pointed in the right direction Just gonna share my weight and all I know I’m hella big but I’m 6’2 male and almost near 400 pounds pre diabetic I do truck driving for Amazon so mostly sit on my ass all day 4pm to 2:30am work 4 days off 3 days Ive got into 2 car accident back to back of last year august i didnt get any injuries nor felt like i was trauma but 2 weeks later after the accident I’ve been waking up middle of the nights heart racing sometimes sweating for the past 5 months my doctor tells me if I lose the weight I’ll feel better they ran tons of test on me seems like its panic attack or anxiety now I notice my body changing feels like im developing ED which sucks and most likely because I’m overweight and just generally tired of feeling this way and would love to give it my all to met my goal Trying to lose hella weight got prescribed them weight loss shots ppl be talking about gonna get them in a week I believe but my goal is to lose all this weight but im not sure where to start I’ve been cutting calories this week eating healthier and plan to go walk an hour or 2 on my days off usually can’t really do much exercise during my work days due to coming home by 4am shower and all then get the kids ready for school by the time I’m home it’s 8am and I gotta sleep to be at work by 4pm takes me an hour to get to work so it’s really hard to squeeze something in during my work week and only see opportunity to workout during my days off I’ll really appreciate any advice, tips and meals that I should be eating thank you!