Without going into too much detail, I have had health issues that have left me chronically fatigued for the past 8 months (the health issues came first and were obvious, so don't worry: its not the same for you as it is for me).
I wouldn't worry too much about the fatigue itself. It is often a symptom of an overworked mind and body that is in some serious need of a prolonged rest. By this I do not necessarily mean lying in bed for a few weeks (though this could help). I mean your poor nerves need a rest from all the anxious thinking you are doing. This could very well be a paragraph to myself.
Moreover I very regularly get the forehead pressure too. Along with pressure across my nose and in my teeth. It can be very odd and disconcerting at times. Its worthy of a mention to your doctor, however in the majority of cases it is due to muscular tension (especially when anxiety is involved). Again, I may very well be writing to myself.
Fatigue plays horrible tricks with the mind. I get confused easily and often despair of my current situation. However, those tired and anxious thoughts are very, very rarely an accurate representation of your current situation. More often than not they are an exaggeration of your fears because you don't have the mental capacity for rational thought and so your mind defaults to what it thinks will keep it the safest. Unfortunately this is counterintuitive to our continued health.
I encourage you to seriously and routinely practice deep relaxation exercises of which there are many too choose, and try to give yourself a break for feeling so exhausted. Moreover, if you believe your marriage to be suffering its essential to open clear lines of communication and ask for support without adding too much pressure to your spouse. These times can be difficult for those around us as I am all too aware. It is essential that there is a mutual understanding and both support made available and boundaries made clear. Though we often want to vent to those around us, it puts them under pressure and this is what professionals are for! I encourage you to seek some professional counselling.
Best of luck