Briss, I really sympathise with both the desire for coffee and pastries in the morning, and the difficulty of relaxing.
I do indulge in pastries sometimes (I had a pain au chocolat this morning) but on those days I try to make up for it by having super-healthy stuff later like extra veg and fruit and things like avocado and oily fish. To me, this is all linked in with the 'trying to relax' stuff. I'm strict most of the time, but not too strict because I imagine that'll actually be counter-productive and stress me out or make me tense.
I have the occasional glass of wine, I had coffee this week (although I normally avoid it). It's all about getting a balance - getting a healthy fertility diet but not getting so worried it makes me stressed. I also find it helps to concentrate on choosing from what I can eat, rather than thinking about what I can't. And I treat myself with exotic fruit, or posh veg, or expensive oily fish like wild salmon.
The 'trying to relax' bit is hard because as time goes by, it's perfectly understandable to get anxious. If I had £1 for every time I'd sat here worrying about my age (I'm 46) I'd be a millionnaire! Sometimes I go through phases of beating myself up about it and telling myself all kinds of cr*p - my ovaries are rubbish, I'm too old, it'll never happen, etc etc. But then I remind myself, there's always a way and that there are plenty of options and things to try.
To help the relaxing, I take something called She Oak. I don't take it all the time - just for one month when i'm feeling particularly stressed, then not again for a few months. I got it here:
https://www.baldwins.co.uk/supplements-essences/flower-essences/australian-bush-essences/individual-essences/australian-bush-flower-essences-she-oak-15ml
It sounds daft but I really felt it helped. I had one month last year when I felt desperate and so tearful and stressed. I then read about the She Oak, bought some, and had 7 drops in the morning and 7 drops in the evening (under my tongue) and within a few days I felt noticeably calmer.
It's hard trying to conceive, it really is. To be positive and balance your hopes against your worries is really difficult.
I don't know if any of that helps, but I hope it does. Remember every little thing you do can help - it's all tiny steps towards your goal. So concentrate on all the good things you've done (and it sounds like you're doing a lot). I make myself do that every morning and evening, and it does help and it stops the panic that can sometimes build up.