3 month labs and extreme fatigue

Hi Dec. sibs, I got my 3 month labs back finally and it showed I was a bit low in iron. I started the iron supplements immediately and felt fine up until two days ago. Now I feel exhausted to the point of having to sleep, irritable, depressed and my legs ache and feel leaden. I've also been bruising alot which I know can be iron related. Can just a slight iron deficiency cause all these symptoms and has anyone else experienced deficiencies in their labs? Just curious! Thanks guys...