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Hello, I would be happy to assist you.
Spotting would not typically lead to anemia. Only heavy bleeding would. Do you have any medical issues or take any medications? How long have you felt ill and when did you start your sinus medication? When was your last period? Is this the first time you've had irregular bleeding/spotting? Are you trying to conceive? If so, how far apart are your periods?
Also, how many days do you typically bleed for during your period? How often do you have to change your pad/tampon?
Thank you for the additional information.
Since your symtpoms are relatively recent in onset, most likely you have contracted a virus. Anemia is highly unlikely when you have normal periods as you've described. Only if you were a strict vegetarian for several years would this be a possibility. Given the multiple symptoms you have ranging from your head to your chest, most likely you have a viral infection. You should expect these symptoms to improve and resolve within 10-14 days.
I wish you the best. If you have additional questions, please feel free to ask. If none, please rate my answer. Thank you.