There are some restrictions in place for new users to reduce spam on the forum. The only limitation I think you'll encounter is not being able to message other members.
In regards to your project, I doubt that you'll find a digital tool that will be flexible enough for your purpose. As you go through this process, you'll probably find that your metrics and methods are going to change frequently until you settle on something useful. At that point, it would be appropriate to find a tool that will allow you to collect your observations in a reliable manner. This initial stage will be about figuring out the phenomena that you are trying to observe, rather than building the data set that will be easy to analyze later.
In the meantime, I think you have the right idea. Get a notepad that you can carry around with you and start making observations about your blocks and internal resistance. Try to detect differences between different states and build a taxonomy that is meaningful to you.
Although you may be told that tracking internal resistance is wrong-headed, it may be fruitful to try and experience why it isn't helping you gain better insight.
For myself, I haven't tried to track mental blocks, but have looked at the distracting behaviors I engage in when I have those blocks. Initially, I started off using one of those handheld counters just to get me into the habit of recording that behavior. Then, once I picked up on of few meaningful themes I used an app like Tally to record those observations.
I'm not saying that you would follow the same path, just giving you some ideas on how this could go.
In terms of the struggle to track something idiosyncratic, you might find inspiration in this talk on someone tracking her crying and eventually mapping out the different emotions behind each episode. There was not a lot of literature to help her, so she had to create her own taxonomy. https://quantifiedself.com/show-and-tell/?project=1054