Me and my Husband eat the same yet I get constipated all the time?

I cook everyday and me and my Partner eat pretty much the same meals. I eat way more fruits and vegetables than my Husband and he eats double sometimes even triple the amount of carbs than me. I also drink a significant amount of water everyday more than 1,5L per day. My Husband often drinks soft drinks and snacks a lot on crisps and popcorn while me I feel like snacking I usually go for almonds and other types of nuts and dried fruits.

My Husband bowel movements are very regular and he never had any constipation issues. I on the other hand am scared of eating anything that is not a vegetable or fruit with fear of getting constipated. I get so easily constipated to the point that I now carry glycerin suppositories or enemas with me whenever I travel.

I've recently visited a gastroenterology and done all the prescribed exams including an abdominal ultra-sound. On my first appointment Doctor prescribed probiotic capsules that I've previously taken and didn't see much of a difference and psyllium husk supplement twice a day which has actually been great. My next follow up appointment is in one week but I'm a bit concerned and anxious. What could possibly be the reason? Anyone had similar experiences?

Me and my Husband eat the same yet I get constipated all the time?
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