Drupal commerce interacts with "Create content"?

Dear All,
I want build a system like this:
1. Medical records system:
- Profile (user) has all information that rarely changed of patient. Can do with Drupal 7 core or profile 2. That's enough.
- Consultation (content type): Each profile )= patient) can have many times go to hospital, each time = one consultation). We can use relation module to do this: content --> user "direction relation". That's ok.
* Price of each consultation is 10 USD (that means each node is corresponding 10 USD).
- Many other content types: Untra-sound, X-ray, ...
* Price of each above "node": x USD, y USD, ...
- Some content types do not have a hard price. Example: test, prescription of the doctor.
* In a test paper has many item: Gluco test, Bilirubile test, cholesterol test, .... In prescription paper has many items that may be appeared: paracetamol, loratadine, ... (1-10 medicines of 1000s medicines can be chosen). So, each node likes this may be have different price (the price made by various items)
- Some other content types do not have a price ("free").

About how to collect all nodes into a perfect Patient File? That will be done by using relation module
About how to view nice nodes, nice forms? That will be done by various modules. But I still do not know what is the best choice?

2. Commerce System
- "Products - Goods" are medicines, disposables, consultations, X-ray, ...
- All reports, tasks can be done by views and other contributed modules. No need code.
I have learned Drupal Commerce. That's the best for this.
- But have a BIG PROBLEM: How to collect (interact) 2 system together? That means: when we create a "consultation" node, one order will be create too. And a "product" will be add to this order.
After that, when a X-ray is created, a "X-ray product" will be add this order. One more X-ray created, one more "X-ray product" will be add, ...
And an important issue: when a prescription be done, each item with its number (medicine) will be add to the order (of right patient).

If we required good performance, Is it better or not when 2 system should be lived in separate servers. What is the best solution for this?

Many thanks,
P/S:
Dear DC team,
if this issue is not should here, please remove it.