Yuki, what I would do if I loved tomatoes so much is start mixing another vegetable with it - that way you train yourself to eat other things as well.
One thing I made lots of times first time around was a baked dish with chopped up tomato allowance mixed with a chopped up button squash or zucchini. If time, fry an allowable portion of onion and then put that in, cover with an allowable cheese, and then bake in oven.
I don't have time for this so much now, but I really loved that in winter. Zucchini etc don't have much of a taste, so you get the tomato flavour, but are eating some allowable vegetables, and gradually you can cut down tomato and increase other things.
You can add allowable spices and salt to the vege mix before putting cheese on top.
I used to think of this as a "base-less pizza".
If you put a bit of "Bake" paper under it, there's no mess on the tray afterward either.