I think you have to do what is right for you. I understand your mom's comment on some level...in that she loves you and wants to protect you from more misery.
Only you can decide what you want to do with your life and how much is too much. You will find that in your heart at some point in the journey.
Did you ever date someone and for a long time you knew it was not working out however you could not end the relationship? Then one day out of the blue, you just knew you had to end it and you were able to summon the courage to do so?
I think that the steps in fertility treatment are similar to this. I recall when I knew I had to move from OE to DE however I was not ready so I did not make the transition. When I was ready, I just knew it.
Only you can make this decision. If there is still a fire in you, then you need to summon your energy to keep going.
Sending you strength,