Elo hell isn't real. If it was then Unranked to Diamond series wouldn't work and elo boosters would be out of a job.
Massive losing streaks are completely possible. I should know, I've been on one the past month. I started off with a 65% win rate in ranked but over the past month or so my win rate has been like 30% (dropping my overall win rate to 48%.) Its not elo hell, its just bad luck. I know that if I keep playing things will even out eventually. People seem to think they'll reach their true elo within 100 games when that's simply not true. There are too many variables for that. However, if you keep playing you will reach the elo you deserve. Just keep swimming, just keep swimming.
I like to break games into 5 groups:
Type 5: 20% of the time the enemy team is way better than your team (this includes games with feeders/trolls on your team.) These games are pretty much automatic losses.
Type 4: 20% of the time the enemy team is, on average, better than your team. In these games the only way you win is if you absolutely hard carry the game (i.e. high cs, high KDA, high kill participation, high number of objectives destroyed.)
Type 3: 20% of the time the teams are evenly matched. Whether or not you win these games is dependent upon whether you play better or worse than the average person at your elo.
Type 2: 20% of the time your team is, on average, better than the enemy team. In these games you just have to play smart and you'll win (i.e. not suicide, flame your team, throw at baron, etc.)
Type 1: 20% of the time your team is way better than the enemy team (this includes games with feeders/troll on the enemy team.) These games are pretty much automatic wins as long as you don't troll/afk.
If you win all of your Type 1 and Type 2 games that puts you automatically at a 40% win rate. Next, if you win the majority of your Type 3 games that will put you above a 50% win rate and you will climb. The reason why so many people have difficulty climbing is they go on tilt after losing a Type 4 or Type 5 game and they carry that anger into subsequent games, play worse than normal, and lose a Type 1, Type 2, or Type 3 game that they could have won had they not been on tilt.