I agree with talking with your Pastor about your concerns. Many Priests have helped other men work thru this very same issue - especially us converts! Also, addictions can be a cause to receive the Anointing of the Sick and your case certainly seems to have a just cause to ask for it; however, only the Priest can make that call. Also, ask about a good spiritual advisor. Having this third party to help you grow in your spirituality without becoming overly scrupulous while working thru this may be necessary.
Main thing to keep in mind, God loves you.
As trite as this may sound, you’re breaking a habit, an addiction.
Do not try to fool yourself, masturbation can be an addiction and it’s based on one of the most basic aspects of our physical human nature which can make it a particularly difficult habit/addiction to break free from!
Your subconscious is trying to work thru a basic change in behavior, one that released a great deal of a chemical called dopamine in the brain. This is one of the chemicals in the brain that is used to reward “positive” behaviors and is a primary player in addictive behaviors by reinforcing the behavior, I’ll not bore you with the chemistry (but here’s a link to a quick overview).
The two things that really make me think this is an addiction for you are that stress triggers the dreams - it is a known fact that stress will trigger addictive behaviors, and becoming physically ill thinking about your dreams. Because there may be an addiction involved here, in addition to the sacraments and a spiritual advisor, you may also find that the help from a third party support group can help you control this behavior. Yes, they are out there for sexual addictions. Your Pastor or the Chancery office in your diocese may even have the contact information readily available.
(( Just a side note, if you have/had an addiction, it can stick with you. You have to learn about what triggers the behavior and have a good coping mechanism - even if it’s just going to someone you trust and telling them what’s going on - a problem shared is easier to handle ))
Something else I would like for you to consider: once again not to be trite here, the Devil uses our own weakness against us. You’ve had these dreams, you cannot reconcile them, and then the Devil prays upon this to hopefully keep you away from the very things that can help you work thru the issues - the Sacraments and sacramentals. Oh, and the more he can make you think you are unworthy and filthy, the more pleasure he takes in your fall. Read the Book of Job (link here) the closer you get to God the more the Devil will want to test and torment you.