I don't have any such phobia but I once had a dream where I decided to dive as far down into the ocean as I possibly could while wearing a breathing mask with a limited supply of air. But once I was down to a certain point by some weird dream physics logic I started sinking because the pressure of the water above me pushed me down, and down, and down and I was not good enough of a swimmer to swim faster up than it pulled me down. But once I reached the bottom I was able to kick myself up but I didn't quite make it beyond the point where the pressure started pushing me down again. So I was going to try again confident that I just had to put a little more effort into the jump to get up, but I got curious about something that looked like a sleeping woman buried from her waist down into the sand at the bottom, and when I came close her eyes popped open and she grabbed my leg in a lock that I could not possibly break free from. The dream continued for a while with me trying to struggle out of her grasp until my mask ran out of air and then I myself ran out of air and drowned. At which point I woke up.
As for a phobia I probably do have. I would say I have cyno+lupo-phobia. My heart starts beating fast, I start sweating and shaking and my chest feels heavy so I take heavy breaths when I am around dogs. However I feel like I am mocking people with real issues because I've seen others with other phobias and they can't help but scream loudly and run when confronting their fears. While I only have bodily reactions but am able to keep my head clear enough not to scream or run. So do I really have a phobia or something else ? Can phobias vary in strength, like can one person have a small phobia for something while another has a big phobia for something ?
I would assume so, yes. A phobia is simply an irrational fear. It may be possible for one person to irrationally fear a thing, yet still have the ability to try to approach it with a somewhat clear approach while another person may irrationally fear the same thing to a far greater degree and completely panic in such a situation. I'm not a psychologist and I'm pulling things out of the air, but that's how I've always seen phobias. Though then that brings up a debate of what constitutes an irrational fear in the first place versus a rational one.
For example, one arachnophobe may just freak out and run at the sight of all and any spiders while the other may still freak out if spiders are crawling on them and may be tense upon seeing them, but can still approach the spider or spiders in order to kill it or them.