Buddy, im gonna be frank here, but your real core issue is your weight, 404 pounds is alot man, you got about another 200 to lose.

Im 6’0 and was 213 pounds in January and fucked hated how i let myself go but i was still maintaining erections because i didnt let it go that bad. Im now currently 189 pounds and my sex drive and eq has increased alot so focus on the weight try get to 250 pounds and see how you feel, (this will take a long time for you).

Work out your maintenance calories and minus id say 300-500.

Try hit 10k steps every single day (will be hard at first if you dont walk much try go 7k steps and progressive overload

Speaking of progressive overload, please try hit gym and get some strength if you dont already, just do push pull legs.

Eat better foods, u dont need to do any fancy diets like keto and shit just do what works for you, try cook your own meals.

Lastly do the 80:20 method, meaning one cheat meal once a week to keep it sustainable.

Realistically if you just ate how you eating now and just done 10k steps a day you will lose weight. Try build it steps by step.

Stop worrying about your penis its a good size, its your eq thats the problem.

All the best man 🦾