If this occurs, Virginia allows you to ask the court to order the terms of your separation for you. You can file for a divorce from bed and board, which is a legal form of separation in Virginia. Despite the word divorce, your marriage doesn't end. You're not free to remarry. However, the court will enter a judgment after a trial, issuing an order to address things like custody, property division and support.
Yes, you can have constipation cause nausea and fatigue and it makes sense if you think about it. Stools are our bodies getting rid of undigestable matter and toxins. If those toxins build one can get quite sick from it.
Rarely, dizziness may be due to a serious medical condition. These can include an acute stroke or a brain tumor, especially if accompanied by other concerning symptoms, such as dis-coordination, headache, or weakness. It is unlikely that the dizziness is related to your stomach condition. I the case that your 'digestive problems' were related to a stomach ulcer or other source of intestinal bleeding, chronic loss of blood could lead to anemia, which could cause fatigue and dizziness. If your bowel movements are occasionally dark black in color, this possibility is more likely.