Do you think you may have had the flu? The tiredness symptoms are usually worse with the flu than a cold. See:
It is good that you are making sure that you are eating and drinking enough.
As far as anemia, the only way to tell for sure is by a blood test. In severe anemia you would be tired, your mucus membraines (lips, corner of eye, etc.) and nail beds would appear paler than normal and sometimes your heart rate would be elevated (normal heart rate is 60 to 100 beats per minute). Spinich, meat, liver, raisens, are some foods which help replace iron in iron poor anemia.
Read over the flu symptoms above and see if any other symptoms sound familiar. If this problem continues, yes I would suggest you see your primary care physician.
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You can have the flu without all of those symptoms, but you know best as far as what you felt you had, regarding the cold.
Weakness and shakiness can indicate an electrolye imbalance. Are you taking medications for anything? Often people get electrolye imbalance if they are taking diuretics or blood pressure medication, sweating excessively, or having nausea and vomiting.
You are also right that an increased blood sugar could make you feel lethargic and shakey.
Arsenic or mecury posioning, antidepressants and lithium, certain antipsychotics can also cause shaking.
So if you are on any medication, let me know what they are.
There are also more severe illnesses that effect the central nervous system such as Multiple Sclerosis, ALS, Parkinson's disease. Let hope it is not anything that serious. The only way to tell would be to see your physician for testing, and possibly a neurologist depending on the type of shaking you are having.
If it is an electrolye problem usually something would have caused it, and the only thing I didn't mention would be excessive water intake (very rare) or excessive enemas.
Drinking gatoraid can replace electrolytes. Eating banana's helps to replace Potassium (K+) which is lost when people take diuretics and blood pressure pills, or have vomiting, diarrhea, excess loss of blood.
In the meantime, continue to eat a healthy diet. Since you did have a cold, it is possible you are still recovering. Try to eat a lot of fruits, vegetables and protein.
If you don't get better you will need lab work from your doctor's office. Make note of any other symptoms you have.
I do hope this helps and that you get better soon. Let us know how you do.