You have an emotional roller coaster because you make your emotions dependent of what you observe. You focus on what is and when what is pleases you (like you painting for example) you are happy and that's great but when what is doesn't please you it kills your alignment. Is a broken toaster really worth to kill your alignment? I don't think so. I think manifesting a new one is one of the easier things to do. I would use it to test my manifestation skills and have fun with it.

How quickly something manifests is up to your resistance and where your focus is. At the moment you are vibrating at the frequency of worrying about money and the broken toaster. Try to just feel how wonderful it is to have much money. The way I would go about it is (and it's just my opinion on this): I wouldn't try to convince myself that I already have the money. I would just know that the reality in which I have the money exists now and even when I can't see it now I can feel it and the more I feel it the quicker I shift to that reality.
When you buy something try to be grateful for the things you bought. Don't focus on the money you don't longer have.

In my experience the moment you do it right you know it or don't even think about if you do it right or not. Monitor your thoughts. Do you think about how beautiful it his to have money? Then you do the right thing and just have to do it for a while until you get results. If your focus is still on not enough money or processes to attract money (while we are talking you are very aware of not having enough money, right) your vibe isn't quiet there.

"Yeah there were times when it used to pinch me that it didn't happened yet". By noticing something hasn't happened yet you're slowing down the manifestation. You're feeling the lack of it as opposed to feeling like you already have it. I know it can be hard but you have to try to ignore your current situation and really feel like your desire is done.
When it comes to spending money, what I like to do is remind myself that the money I've just spent is making room for more money to come in. There has to be a flow. If you hold onto all of the money you have you're blocking the flow and disallowing more to come to you. Some people hoard all of their money and never spend it because they have fear based on spending and then being left with none/going without. That is sending out signals of lack to the universe. By feeling bad about spending money you're sending out signals of fear. By worrying about not having enough money you're sending out signals of lack. Buy the things you need and treat yourself once in a while. Don't feel bad about it either, you deserve it. Life is meant to be enjoyed and remember you need to keep giving in order to receive. If you see a donation box for a charity, drop in some change. If you get good service at a restaurant, coffee shop, etc. leave a nice tip. By giving money you're setting yourself up to receive more. Don't only give but try to feel really good about giving. Oh and practicing gratitude also helps with money and abundance in general. If you feel grateful for what you do have you'll attract more of the same. I've heard stories of people receiving unexpected cheques in the mail and once I received a form in the mail to fill out a survey. Attached was a five dollar bill. They were giving away a small cash incentive in hopes that people would be more willing to do the survey. Five dollars isn't a large amount but it was a great surprise and it came at a time when I had been writing gratitude lists daily so I was feeling awesome about receiving it. It was a sign that I was vibing high and the work I was putting into feeling good was paying off. Feeling confidant about money will get easier over time. There are plenty of exercises like the gratitude list that can help with this. Hang in there, this "off" period will pass and you'll be feeling better about things in no time!