Since I began two months ago I haven't traded well, made a few rookie mistakes and haven't been profitable.
I guess you've identified your problem in your own words. Now you have to investigate and dissect what has changed. The possibilities are plenty, so make a list and spend some quality time examining how you react to each item on that list. Start writing and as the words flow, you may be amazed to what more may come out.
I haven't had two losing months back to back since the first few months I started trading a few years ago.
This once again goes to reaffirm that you are losing your consistency.
I haven't felt a slump like this before. I'm starting to doubt myself way too much and passing up on potentially profitable trades.
This statement here shows that the change in environment may not be your only problem.
You are passing up on trades because you are doubting yourself. Do you trade on gut or do you have a system? If you have a system, this should
NOT be an issue and if it is, then you lack conviction in it. You know your set up, you know your entry point, you have your exit strategy before placing your trade and you have your target determined. There is no guess work here; all these parameters are very defined.
Solving this alone can help with some consistency and bring a lot of confidence back.
Once you have identified all the issues, correct them!. Then start trading as small as possible to where a "big" loss won't sting. Print out each chart traded and pay attention to the details of where you went wrong (losing trades) and where you could have done even better (winning trades).
This is probably the most important step and can not be skipped.
As your results start improving, your confidence will follow. You can then start trading bigger again.
Sometimes the issue may not be you, but your environment. If the traders presence at the firm is disruptive, it may be okay to just go back to trading from home. If you need some productive breaks at slow times, there's plenty to keep you occupied. Reading, you can never do too many crunches (gets the blood flowing), you have a decent amount of members on ET that have their PhD in Trolling (it can get interesting when they gain some momentum

) and at last resort, you can invite your partner to come and "try out" your trading chair

(make this "trial" a quick one; we wouldn't want to miss out on some good setups right?).
Be persistent and all shall settle.
Best of luck,
Alpha.