Take some iron pills, OTC type ok as long as there is at least 100mg of FeSO4 or 180mg of Fe gluconate, the most common iron sources. One with each meal for a week and then twice daily for several weeks. Your bone marrow has already started to crank up and with a bit of extra fuel (Fe) will replace the blood donated in 2-3wks.
Your LT and wind will return to status quo. Expect #2 to turn grey or black while on iron supplements.
Steve