I worked as a per diem health worker. I didn't receive a form from my employer for this. Is there supposed to be a form or should I add it from my bank statements?

[LeonardS]

No, there is no form and you do not add it from your bank account.

Per diem payments are not considered wages—and are therefore non-taxable—as long as they meet certain conditions. You will be subject to taxes if any of the following are true: Payment is more than the allowable federal per diem rate. You did not file an expense report with your employer

[keithb95]

Googling for:
How are per diem employees taxed?

returns:

Per diem payments are not considered wages—and are therefore non-taxable—as long as they meet certain conditions. 

Also see:

https://www.taxslayerpro.com/blog/post/per-diem-tax

[ColeenD3]

Is this a reimbursement of expenses or is this income from your job?  If it is a reimbursement, follow the advice from @Leonard Smith. If this is income, see below.

Your per diems should have either been on Form W-2 or 1099-NEC if the persons you are working for do not consider you an employee. 

Enter your self-employment income on Schedule C.

Follow these steps to go to the Schedule C section of your return:

On the top right corner of TurboTax online screen, click on Search (or for CD/downloaded TurboTax locate the search box in the upper right corner).

1. Type in “schedule c” (or for CD/downloaded TurboTax, click Find).
2. Click on “Jump to schedule c”.
3. Click on the blue “Jump to schedule c” link