Celey if you increase your fiber intake, be sure to take it slowly. For example if you take Fiber tablets and it says take 3 a day, start off with just one for say a week or two and then slowly increase. Fiber supplements cause me to feel worse, but the stool softners work well
for me when I take them nightly.
I am glad you are getting the ultrasound. Hopefully it will show something and then your docs can get you feeling better. The fungal thing could be a possibility, but I am kinda doubtful. To help with that you could take a probiotic, not sure if you said you have been taking any. Those really helped me alot. I was having 5-7 loose stools a day and now I only have one or two per day and they are more formed.
Celey have you had any tests to see if you have any strictures or narrowing? The way you are feeling sounds like you have some kind of stricture or narrowing. The nausea after eating, constipation etc.
Sure hope you get some answers soon and get feeling better too. (((BIG HUGS)))