I have been on bed rest for almost 3 months and walking makes me feel tired. my blood work was normal in march. could my iron have gotten low by now?

Low iron: It's possible to have low iron even though there is no anemia,but low iron itself shouldn't make you feel so tired and weak that you needed bed rest for 3 months. Other reasons for such symptoms such as glandular deficiencies,chronic infection,vitamin or mineral deficiencies, or inflammation,neurologic disorders or depression have to be considered.