I believe this falls under the realm of a neurosurgeon, besides an ascending aortic aneurysm I also had a brain aneurysm, mine was in the supraclinoid. If I am correct, for brain aneurysms 5mm is considered large and yours is 7mm, probably that is why the Dr said high risk of bleeding.

There is a separate forum for brain aneurysms in Mayo Clinic Connect, you may want to post there. I highly recommend you see an experienced neurosurgeon ASAP. Normally for brain aneurysms if they have vascular access they can be fixed through embolization (with a catheter inserted through your groin, it is minimally invasive and fast recovery, like mine was) either with a stent or a coil. If it does not have access, craniotomy is the option. Neurosurgery teams will have specialists for both types of surgery and they will define which one applies to you.

All the best