Hello, I'd like to help you with your question.
The reason you feel as you do could possibly be two things. One, your hormones are out of balance or you have a physical issue and it is causing you to feel this way. The reason why that is possible is because what you feel came on suddenly and second, you have some physical symptoms. While it is not likely this is a physical issue, it is still worth checking out just to be sure. You always want to rule out a physical cause before you consider an emotional one.
Most likely, however, what you are experiencing is an emotional response. It could be that you are feeling overwhelmed, even if you are having a good time on vacation. Sometimes when people are having fun and enjoying themselves, they will experience a sudden feeling of depression or anxiety
which seems to come out of the blue. Often it is due to something mild, such as realizing that you are "letting go" and having fun. For some people, that can cause anxiety. You may just need to realize that you are ok and help yourself relax.
In order to help yourself relax, focusing on what you feel for a little while helps. You can help yourself by telling yourself that you are ok. You may not feel like you did
before, but these feelings will pass.
You may also want to try a relaxation technique to help yourself focus and relax. Here is a link to help you:
If you feel that these things are not working, try contacting your doctor for a mild medication that can help you feel calmer, such as Ativan. You can take Ativan as needed and it helps take the edge off your symptoms until you can address what you feel when you get home with your doctor or with a therapist. Unless you start to feel worse, there is no reason to give up your vacation and go home.
I hope this has helped you,