Hello and thank you for your question,
It is not unusual to have anemia in a woman who has not reached menopause. Given the fact that you are 44 years old, I am assuming you are still having regular periods. If your periods are heavy, that makes you more likely to have anemia.
If that's the case, you should not be concerned and slow-Fe should bring up the levels of iron and improve your anemia.
However, if your periods are very light, not frequent or if you have stopped having them all together, you do need to have Colonoscopy and Endoscopy to make sure you do not have any source of blood loss in your colon or in your stomach. If you have any abdominal pain, changes in bowel habits, blood in your stool, then you should definitely proceed with having colonoscopy/endoscopy done.
The symptoms of being tired and cold are typical for someone with anemia and do not, by themselves, imply of any serious conditions.
I hope you find this information helpful. Please feel free to follow-up with any other questions you might have.
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Best wishes and good luck,