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The itch you describe absolutely sounds like an allergic response.
While it is nearly impossible to identify the source of the itch, allergies of the eye are treated the same way.
There are some over-the-counter treatments for allergies of the eye.
Here is an article that explains the problem in greater detail.
I suggest starting with an over-the-counter medication called Zaditor or Alaway. These drops can be used twice a day and I suggest putting them in both eyes, even though the left eye is the one causing problems.
The appearance of your inner lid sounds like a sign called papillae. These papillae or bumps of the lid are also caused by allergies.
Some allergic responses of the eye do require more aggressive treatment. If you don't notice an improvement with the eye drops it would be advisable to seek additional treatment.
Many doctors will be able to see you without insurance. Some optometrists (even Walmart or Target doctors) have a special rate for self-paying red eye examinations that may be as little as $40. It may be worth it to be seen, but again, if you would like to try treating it on your own, I suggest the over-the-counter drops.
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Also, please note that the information here does not replace an examination and should be used as educational purposes only.