Just found out that is you are on Omeprazole you should also be considering taking a Vit B12 supplement.
Article reads:
all people taking omeprazole need to either supplement with vitamin B12 or have their vitamin B12 status checked on a yearly basis. Even relatively small amounts of vitamin B12 such as 10–50 mcg per day, are likely to protect against drug induced vitamin depletion.
Vit B12
Symptoms of vitamin B12 and folate deficiency anaemia include:
rapid breathing or shortness of breath
headaches
indigestion
loss of appetite
palpitations
problems with your vision
feeling weak or tired
diarrhoea
a sore or red tongue, sometimes with mouth ulcers
problems with memory, understanding and judgment (cognitive changes)