Thanks for the feedback!
It's good enough that some factors can be identified such as forcing (to go to the bathroom), or a change in mood. These will need to be avoided, if possible.
In relation to straining to have a bowel movement, this can be avoided by increasing his fiber intake as in fruits & vegetables, whole grains (oatmeal, brown bread, brown rice, etc.) and drinking plenty of fluids. If needed, a product can be suggested at the pharmacy to help relieve constipation.
If the pain occurs while lifting or exercising, the first thing to check for is whether he is 'holding his breath' when he exerts himself. This can greatly increase sinus pressure, even if only for a short time, and is definitely to be avoided (ditto when he has a bowel movement).
As for the migraine itself, if your spouse's asthma is well controlled, ibuprofen (Advil, Motrin, and other brands) may be more effective than Tylenol for the migraine. Keep in mind that in some people, using anti-inflammatory drugs like Advil can worsen asthma or trigger an asthma attack, although this remains rare.
If these measures don't work, a doctor should be consulted for a thorough evaluation of one's condition as a precautionary measure.
Cordially
Tom Samaha, pharmacist