Need Bicycle to start losing weight!

I am 35 yrs old and due to being over weight am having a hard time standing and walking due to Plantar fasciitis my heels hurt really bad!! I have also been having issues with my heart which scares me. I need your help.. i have a hard time with gyms i always feel judged or eyes on me and uncomfortable and hate being inside when i could be exploring the countryside. I love riding bikes though, always have. I was doing great and losing weight with the bike i had. a surley 1x1 but, it got stolen and i kinda gave up. it was a good strong bike to it was able to hold me at 350 lbs. I am now pushing 370 so need a strong good bike. a walmart bike aint gunna do it!I am going to be posting pics and progress if i get my goal for a bike! thank you all for reading this and maybe helping me. Also if you have a good bike you wanna donate to me that would work to. hmu on facebook ot twitter. or send me a personal message here!