I am 51 years old,a female..fir the past few days...

What is the cause of your symptoms ?
Well, there are many diseases the maigh be behind your symptoms such as anemia, heart problem, vitamin D deficiency and others causes
How to treat your condition?
Well, first of all you should visit a doctor to assess your condition then you will be accordigly. It's advised to get enough ammount of sleeping and rest, start a healthy diet rich in vitamins and minerals, drink a plenty of water in average of 2 liter per day. Try to avoid spicy food, alcohol intake, to quit smoking and to avoid stress and anxiety. For vitamin D defeciency, you can take Vit. D tab 50000 IU one tab per week for 6-12 weeks. For anemia, you will get benifet from taking iron tabs pr vitamin B-12 tabs
What are the needed tests to be done ?
Firstly, you should undergo a physical examination by doctor. Secondly, it's quite pbvious that we need to run some tests such as completet blood count will be ordered to check the hemoglobin level. Blood sugar to exclude diabetes. Measuring Vitamin D level in the blood. Stool analysis and urea breath test for H.pylori
Advice
You should follow the previous advices and follow up with you health provider