Thank you both for your lovely messages & encouraging words. Sorry to hear that you had a similar upbringing, Socalgrl. Thank you also for the book recommendations. I love to read so I have added those to my list, alongside Cognitive Behavioural Therapy For Dummies. I've always been fascinated by psychology & things on a much deeper level.
I will further clean up my diet. I think my problem is that I snack a lot especially when I'm sat at the PC working, so I will have to find some healthy alternatives ;-) I already use natural personal care items (coconut oil on my hair & skin, Dr Bronner's soap, etc), but will need to work on the other environmental toxins (cleaning products, etc).
I will take your advice about ridding myself of negative people too.