I'm only 7 weeks but the fatigue I'm feeling is unreal

I've always suffered with tiredness but this is next level. I feel like I could fall asleep most days at work, I get super dizzy and as soon as I get home I have zero energy to do anything else. Weekends are pretty much a right off as I need to try to recoup as much energy as possible to get back into work on the Monday. I feel awful because family and friends ask me to do stuff with them but I genuinely don't have the energy to get out of the house most days. Is this normal? And will it get better by the 2nd trimester? I've started panicking thinking I'm not cut out for motherhood because if I'm this exhausted now how will I manage when baby is actually here

sorry for the long rant, I'm just freaking out that something is wrong with me

I do have low iron which I have tablets for that make me really ill so the doctor has told me to cut back on the prescribed dose. I feel like I may have low blood pressure or something and I get breathless from simple chores around the house. My BMI is in the normal range and my midwife has no concerns and has put me as low risk so maybe I'm worrying unnecessarily.