Dealing with injury problems?

i am a 22 year old male from ireland. I play a sport called gaelic football. At the age of 18 i suffered a serious back injury in a collision with another player. I damaged nerves along my spine and now suffer from severe sciatica. As a result both my legs are weak and i have very tight hamstrings. In the years after the accident i went through hell with it, i lost weight and at times i could nt work, walk or even do very little. I missed 2 years at uni over it and lost a special someone over it too. Before it happened i was a promising footballer with a large 6'3 height and frame but now every time i attempt to rediscover my ability i keep getting injured. I have suffered everything possible. knee injuries, hamstring injuries, back spasms, groin injuries etcc. My right hamstring snaps at least twice a season. as a result of the back i have also developed hip problems. Not only the injuries but my hole health seems to suffer. This year i have had 2 serious viruses including glandular fever. Carrying all this into games means i only seem to play on rare occasion as i dont perform, i only feature in 1 in every 2 or 3 games.Some people have told me to retire but i love the game too much. what should i do??