Allison.
(just my view below)
There are a lot of things in your post , so a few queries for you, please.
1. You state that with one large loan you can save ? That tells me your situation is well sortable.
Let us know total owed to everyone , your net cash you have free per week/month and we can give you what your repayments will be on all loan or loans.
In that way you will see can you manage a large loan , or indeed how much you can put to CC and Union.
Importantly you will see how much free cash you have week on week. ( its too easy to think you either havn,t nuff or to think a large loan is easy)
2. It is probable your credit rating is (harmed) in that most Credit Unions are on the ( ICB)Irish credit bureau. I presume CC is getting @ least interest every month.
Your situation is Not the end of the world but needs to start being repaired now.
It will come down to seeing have you nuff weekly funds over a few years to sort things.