Anyone else have stomach issues when adjusting to their new

Before I start, I do have a doctor's appointment this afternoon. That being said...

I began this journey 2 and a half week ago and in the first week and a half, lost 14 pounds. This week, it's a whole other story!

Before, I would one meal a day. I was never hungry and usually had to force myself to eat a meal, and it was usually at a fast food restaurant and full of calories and fat. I was tired all of the time, I had no energy, I would sleep until 1pm or 2pm every weekend, and I huff and puffed going up any kind of stairs or walking long distances. I drank a lot of soda (2 20oz Cokes or more each day) and never drank any water. When I did have cravings, it would be either for sweets or protein, depending on the time of the month (if you know what I mean).

I recently turned 31 and had hit 295lbs. I was so disgusted by this I decided that a change was in order. My husband, who was 210 when I met him and 320+ at his highest weight, jumped on board when I convinced him that it would be cheaper than eating out all the time and we could make it convenient for our "busy lifestyle". We decided to start a new way of eating and incorporated the Slim Fast shakes into it but increased their recommended 1200 calories a day to fit our needs (I'm at 1400 a day and he's at about 1700). We started walking a minimum of 2 miles every night - no exceptions! - and we're up to 3 miles comfortably and he's starting to run again. I've also been adding aerobic workouts into my routine 3-4 times a week. I've also stopped drinking almost anything but water (will have some milk or tea rarely).

Now, I know I have had some slips, but I have basically kept my calories in check. I have a hard time, mostly because of the processed foods, keeping the sodium, carbs, and fat in check and I am not getting as much protein as I would like. However, most days I am under my calorie goal.

Before I go further, I want to apologize for the tmi I am about to share. This past week, though, I have been having horrible stomach issues. They seem to pass as the day progresses, but in the mornings, they are quite debilitating. Within an hour of waking up, I get horrible double-you-over cramps. I get nauseous and feel so bloated. The scale says I've added up to 5 pounds onto my lowest weight, depending on the day. This morning, it was 3.5 pounds. The jeans that had previous been very loose was very hard to button and zip and hurt my stomach when I fastened them. I will get terrible constipation followed immediately by diarrhea and the whole time I want to throw up. My whole body will feel swollen and it makes me skin sensitive to the touch. Like I said, this usually passes as the day progresses and by the end of the day I am able to work and function and do my workouts. However, I wake up the next morning and start the process all over again.

I don't know what's going on or why? It makes me want to go back to one meal a day just to make the stomach issues go away. Has anyone else had these sort of problems? What did you do for them?