i feel my urine or sperm go backward..wen erect..feel that penis is sucking things in...plz help

hi there,
i have a strange problem...some of my urine go backward wen im doing it...i had difficulty urinating..rapid heartbeats, and i feel to urinate constantly...i visited doctor and he said my urine flow is very slow and some urine go backward in urethurs...he gave me an appointement which is aftr three weeks..but i want to know what could this problem be...
i have been having difficulty urinating for a long time and also urge to urinate often is smthing very old...did blood tests..no sugar or any problem with it....wen i was young..i used to press tip of my penis during ejaculation and this used to make sperm go back as i didnt wanted it come out specially when i was sleeping in my room..i know it was stupid but i used to do this way...also sometimes i used to sleep on my chest and press my penis against the floor and used to ejaculate this way....i never had problems with erection but now things looking a bit difficult to me....i feel my penis working oppositely..for example wen erect instead of moving upward..it moves downwards...i mean wen it is hard, it is difficult to move it toward naval areas for exampe...but it can go the other way easier....i hope i dont have to wait for three weeks to get an idea about it...i just want to knw what possible problems can happen in situations i mentioned......thanks...