Op people here aren't having a go at you. Even though it probably doesn't feel like it people are actually trying help. I do think your tiredness Is down to your diet.
My food intake used to be very similar to yours. I put on extra weight over Christmas and was constantly feeling tired with no energy whatsoever. I used to go back to bed most days as I just couldn't function properly.
Also I was bloated a lot of the time and had problems with my stomach.
I knew I had to tackle my eating habits and try to get rid of the extra weight. Like you I am small in height and build and any extra shows straight away. Crisps and bread were my biggest downfall.
I didn't class it as a diet as I've never been able to stick to a diet ever, so I concentrated changing the way I eat. I loosely followed low carb.
I cut out bread, pasta, potatoes and rice completely. Cut down dramatically on high sugar foods like chocolate, cake, sweets, bisuits etc.
Also meant crisps were out as were anything like pasties and sausage rolls.
I eat lots of chicken, fish, salad, eggs, soup and veg. If I had a sweet craving I would have fruit or a yoghurt in the beginning. But now I don't really have sweet cravings at all. I haven't had crisps for a couple of months and I really don't miss them.
I lost the extra 7 lbs in no time at all.
I am no longer bloated or tired the amount of energy I have is fantastic (haven't felt this good in years!!) , Also my stomach problems have subsided.
The couple of times I did give in and had a takeaway or unhealthy meal out that included lots of carbs I found that I would be hungry a couple of hours later even though I couldn't possibly need any more food. Also I did indeed feel like crap the next day with a horrible pains in my stomach. Also anything high in salt really affects me as well.
I know now that when I am hungry I am genuinely hungry and its no longer a carb craving
I don't think I will ever go back to eating bread and rice (these affect me more)and If I do go back to Pasta and potatoes it will be very limited as they do make me want to eat more. I still have chocolate or cake every now and again
If you try and take on some of the advice that has already been given, you will honestly feel better.
It sounds like you know what you have to do but as i know making those changes isn't always easy. You have to get yourself in the right mind set and if you haven't got that you wont be successful.
You have already started off with small changes to your diet, keep that up and do one thing at a time, rather than cut everything out all at once. A healthier diet honestly will give you more energy.
But Good Luck with however you choose to do it.