To answer your specific question of whether or not you should seek help, the answer is yes. As you noted in your letter, your symptoms are beginning to overwhelm your life. When you notice a problem developing you should not wait to seek help. It’s always best to seek treatment sooner rather than later.
You wonder whether you have an underlying psychological condition. It is a possibility but it is difficult to determine. Your symptoms are relatively understandable given the fact that you have recently experienced multiple difficult and traumatic experiences. Many individuals would have difficulty coping with the events you have experienced.
These traumatic events may have triggered or increased the intensity of your (possible) depression and anxiety. This would explain why you are having nightmares and why it is increasingly difficult for you to concentrate, but it does not explain your casual sexual behavior. This behavior may be your way of dealing with anxiety. One thing seems certain: it is a self-sabotaging type of behavior. You feel guilty after the sex act but it’s as though you cannot stop yourself from doing it. If this is true, it signifies a certain level of impulsivity and inability to control your behavior on those occasions. It might also be a sign of mania which is a symptom of bipolar disorder. Bipolar disorder is a mood disorder in which an individual sometimes feels very depressed and other times very happy and euphoric. Please keep in mind that these aforementioned ideas about a possible diagnosis are based on very limited information. It’s best to have a psychiatric evaluation before making a diagnosis.
As I said above, I believe you do need professional help. This is especially true for two reasons. One is because you have limited support from friends and family. The second is because the symptoms are increasingly becoming worse and negatively affecting your life. If you’d like to search for a therapist in your community, please click on the find help tab at the top of this page.
If you have additional questions, please do not hesitate to write again. I hope you’re able to find the help that you need. I wish you well. Please take care.