I'm in the 3rd level of the Temple of Agamanus which has lots of swimming parts. There are 2 ways of getting to the place I need to go that involve swimming. I tried both ways and each time there was a point were I was not allowed to swim farther. I could turn around and swim back but there was like an invisible wall keeping me from progressing. I saved and quit and when I loaded up my save I was unable to move at all in the water. Is this a game ending glitch?

can you swim in other dungeons still? if so, maybe you need to restart this one......if it happens again, come back with passwall and levitate spells to get through it all.

I was able to swim in other dungeons, and I only have one save so I would have to start over from the beginning. :/

no, what i mean is, go back to the first level then come back down to the second again and see if the problem is still there. changing cells might 'reset' it. If it doesnt work, then try going completely out of the dungeon and going to a town or something that has water and swimming.

You dont have to overwrite your current save, just need to see if it only happening there and if you can fixi t by going elsewhere.

The problem is that now I can't move at all so I can't get out of the dungeon.

I'm in the 3rd level of the Temple of Agamanus which has lots of swimming parts. There are 2 ways of getting to the place I need to go that involve swimming. I tried both ways and each time there was a point were I was not allowed to swim farther. I could turn around and swim back but there was like an invisible wall keeping me from progressing. I saved and quit and when I loaded up my save I was unable to move at all in the water. Is this a game ending glitch?

It's extremely unlikely to be a glitch. If I were to guess, I'd say you are bumping into a ghost who isn't letting you pass. That dungeon is simply stinky with undead. Is your character a Mage class? If so, you will see your magic be drained by the ghost's typical attack. Otherwise it can be pretty mysterious. There are more levitating monsters besides ghosts, but they would likely be killing you very quickly in addition to blocking you, so it's most likely a ghost.

You have a few options for continuing.

1. Cast (via your own magickal capabilities or via a Mark/Crystal/Bracers/Ring) a ranged damage spell in the direction you want to move but cannot. Enough of those and you'll kill the ghost.
2. Cast Passwall on the walls around the blockage and meet the ghost on your own terms.
3. Leave the dungeon level and come back. The dungeon level will re-seed itself with all monsters back where they are originally planted. Go through again and maybe the ghost will take a different path to you and you won't be blocked.