Interested in Language
Do "to get hold" and "to come across generally have the same meaning such as in this sentence?
1) I was tyding my room up when I came across an old picture.
2) I was tyding my room up when I got hold of an old picture.
The two do not mean the same thing. "Came across" simply suggests that you found it amongst your things. You may have just noticed it, or seen it, or you might have picked it up and looked at it and then done something else with it. It's not clear. It just means you discovered it.
If you "got hold of" it then you definitely picked it up. It doesn't really fit with your paragraph though.
Sentence 1 is much better - with the correct spelling of tidying.